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1. 1:1,000,000-Scale Coastline of the United States, 2014

2014. National Atlas of the United States. This line shapefile includes Global Map data showing the coastline of the United States, Puerto Rico, and the U.S. Virgin Islands. The United State... National Atlas of the United States.

2. 1:1,000,000-Scale Contours of the Conterminous United States

2014. Geological Survey (U.S.). This line shapefile shows elevation contour lines for the conterminous United States. The map layer was derived from the 100-meter resolution eleva... National Atlas of the United States.

3. 1:1,000,000-Scale County Boundary Lines of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile contains the county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. This layer was derived from t... Geological Survey (U.S.).

4. 1:1,000,000-Scale Ferries of the United States, 2014

2014. National Atlas of the United States. This map layer portrays the ferries on major roads in the United States and Puerto Rico. Ferries are ships that carry vehicles, passengers, and car... National Atlas of the United States.

5. 1:1,000,000-Scale Railroads, United States, 2014

2014. National Atlas of the United States. This line shapefile represents railroads in the conterminous United States and Alaska for 2014 at 1:1,000,000 scale. This is a revised version of t... National Atlas of the United States.

6. 1:1,000,000-Scale Streams of the United States, 2014

2014. Geological Survey (U.S.). This map layer shows streams of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was produced primarily from the Medium-R... Geological Survey (U.S.).

7. Bike Facilities, Cambridge, Massachusetts, 2014

2014. Cambridge (Mass.). Geographic Information Systems. This line layer indicates streets within the City of Cambridge that have pavement markings or construction features that facilitate bicycle use. It... Cambridge (Mass.). Geographic Information Systems.

8. Global Map: 1:1,000,000 Major Roads, United States, 2014

2014. National Atlas of the United States. This line shapefile includes Global Map data showing the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The data are a... National Atlas of the United States.

9. Global Map: 1:1,000,000-Scale Canals and Aqueducts of the United States, 2014

2014. National Atlas of the United States. This line shapefile includes Global Map data showing the canals, aqueducts, and the Intracoastal Waterway in the United States, Puerto Rico, and th... National Atlas of the United States.

10. Global Map: 1:1,000,000-Scale Ferries of the United States, 2014

2014. National Atlas of the United States. This line shapefile includes Global Map data showing ferries on major roads in the United States and Puerto Rico. Ferries are ships that carry vehi... National Atlas of the United States.

11. Global Map: 1:1,000,000-Scale Major Roads of the United States, 2014

2014. National Atlas of the United States. This map layer portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the indivi... National Atlas of the United States.

12. Global Map: 1:1,000,000-Scale Political Boundary Lines of the United States, 2014

2014. National Atlas of the United States. This line shapefile includes Global Map data showing the counties and equivalent entities of the United States, Puerto Rico, and the U.S. Virgin Is... National Atlas of the United States.

13. Global Map: 1:1,000,000-Scale Railroads of the United States, 2014

2014. National Atlas of the United States. This line shapefile includes Global Map data showing railroads in the conterminous United States and Alaska. The data are a modified version of the... National Atlas of the United States.

14. Global Map: 1:1,000,000-Scale Streams of the United States, 2014

2014. National Atlas of the United States. This line shapefile includes Global Map data showing streams in the United States, Puerto Rico, and the U.S. Virgin Islands. The data are a modifie... National Atlas of the United States.

15. Major Roads, Cambridge, Massachusetts, 2014

2014. Cambridge (Mass.). Geographic Information Systems. Major roads within the City of Cambridge. Cambridge (Mass.). Geographic Information Systems.

16. Snow Emergency Tow Routes, Cambridge, Massachusetts, 2014

2014. Cambridge (Mass.). Geographic Information Systems. The information on this map is for general informational purposes only and the actually SNOW emergency signs posted on street are the legal Traffic... Cambridge (Mass.). Geographic Information Systems.

17. Street Centerlines, Cambridge, Massachusetts, 2014

2014. Cambridge (Mass.). Geographic Information Systems. This line layer contains centerlines of all paved and unpaved roads, ramps, and bridges in the City of Cambridge. Each centerline segment contains ... Cambridge (Mass.). Geographic Information Systems.

18. Subway Lines, Cambridge, Massachusetts, 2014

2014. Cambridge (Mass.). Geographic Information Systems. This line layer has all of the MBTA Subway Lines in Cambridge. Cambridge (Mass.). Geographic Information Systems.

19. Sub Parcel Lines, Cambridge, Massachusetts, FY 2013

2013. Cambridge (Mass.). Geographic Information Systems. This layer contains lines showing how parcels were historically divided in the Assessor's database, where two or more lots were merged into a singl... Cambridge (Mass.). Geographic Information Systems.

20. 1:1,000,000-Scale Major Roads of the United States, 2012

2012. Geological Survey (U.S.). This map layer portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the indivi... Geological Survey (U.S.).

21. 1:1,000,000-Scale Railroads, United States, 2012

2012. National Atlas of the United States. This line shapefile represents railroads in the conterminous United States and Alaska for 2012 at 1:1,000,000 scale. This layer is part of the 1997... National Atlas of the United States.

22. Billboards, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing billboards in Cambridge, Massachusetts, 2010. City of Cambridge IT Department.

23. Curbs, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing curbs in Cambridge, Massachusetts, 2010. City of Cambridge IT Department.

24. Drainage, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing drainage in Cambridge, Massachusetts, 2010. City of Cambridge IT Department.

25. Fences, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing fences in Cambridge, Massachusetts, 2010. City of Cambridge IT Department.

26. Firewalls, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing firewalls in Cambridge, Massachusetts, 2010. City of Cambridge IT Department.

27. Magnetic Field - Declination Component for the Epoch 2010.0

2010. National Geophysical Data Center. This map layer shows isogonic lines (lines of constant declination of the Earth's magnetic field), derived from the International Geomagnetic Refer... National Atlas of the United States.

28. Magnetic Field - Horizontal Component of the Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal horizontal intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference F... National Atlas of the United States.

29. Magnetic Field - Inclination Component for the Epoch 2010.0

2010. National Geophysical Data Center. This shapefile shows isoclinic lines (lines of constant inclination of the Earth's magnetic field), derived from the International Geomagnetic Refe... National Atlas of the United States.

30. Magnetic Field - Secular Variation of the Declination Component for the Epoch 2010.0

2010. National Geophysical Data Center. This map layer shows isoporic lines (lines of equal annual change, or secular variation, in the declination of the Earth's magnetic field), derived... National Atlas of the United States.

31. Magnetic Field - Secular Variation of the Horizontal Component of the Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation) in the horizontal component of the total field intensity of the Earth's ... National Atlas of the United States.

32. Magnetic Field - Secular Variation of the Inclination Component for the Epoch 2010.0

2010. National Geophysical Data Center. This shapefile shows lines of equal annual change (secular variation) in the inclination of the Earth's magnetic field, derived from the Internatio... National Atlas of the United States.

33. Magnetic Field - Secular Variation of the Total Field Component for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation), in the total field intensity of the Earth's magnetic field, derived fro... National Atlas of the United States.

34. Magnetic Field - Secular Variation of the Vertical Component of the Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal annual change (secular variation) in the vertical component of the total field intensity of the Earth's ma... National Atlas of the United States.

35. Magnetic Field - Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This shapefile contains isodynamic lines (lines of equal total intensity of the Earth's magnetic field), derived from the International Geomagnetic... National Atlas of the United States.

36. Magnetic Field - Vertical Component of the Total Field Intensity for the Epoch 2010.0

2010. National Geophysical Data Center. This line shapefile shows lines of equal vertical intensity of the Earth's magnetic field, derived from the International Geomagnetic Reference Fie... National Atlas of the United States.

37. Overhead Signs, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing overhead signs in Cambridge, Massachusetts, 2010. City of Cambridge IT Department.

38. Park Benches, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing park benches in Cambridge, Massachusetts, 2010. City of Cambridge IT Department.

39. Pavement Markings, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing pavement markings in Cambridge, Massachusetts, 2010. City of Cambridge IT Department.

40. Rail lines, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing rail lines in Cambridge, Massachusetts, 2010. City of Cambridge IT Department.

41. Sidewalk Centerlines, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing sidewalk centerlines in Cambridge, Massachusetts, 2014. City of Cambridge IT Department.

42. Walls, Cambridge, Massachusetts, 2010 (pub. 2014)

2010. Cambridge (Mass.). Geographic Information Systems. This layer contains line features representing walls in Cambridge, Massachusetts, 2010. City of Cambridge IT Department.

43. Fault Lines with Line Decorations: Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile represents the major fault lines in the United States. A fault is a fracture or fracture zone in the Earth's crust along which ... Geological Survey (U.S.).

44. Generalized Glacial Limit Lines: Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the glacial limit lines in the United States. This layer is part of the Geologic Map of the United States, originally pub... Geological Survey (U.S.).

45. Generalized Glacial Limit Lines with Line Decorations: Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the glacial limit lines, with line decorations (added for display purposes) in the United States. This layer is part of t... Geological Survey (U.S.).

46. Geologic Unit Text Labels: Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile contains text labels (for display purposes) of the geologic line coverage in the United States. This layer is part of the Geolo... Geological Survey (U.S.).

47. Geologic Units (Lines): Geology of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the outlines of geologic units within the United States. This layer is part of the Geologic Map of the United States, ori... Geological Survey (U.S.).

48. Outlines of Major Calderas and Impact Structures: Generalized Geologic Map of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the outlines of major calderas and impact structures in the United States. A caldera is a large, generally circular depre... Geological Survey (U.S.).

49. Quaternary Fault and Fold Database of the United States (Lines)

2005. Geological Survey (U.S.). This map layer contains locations and information on faults and associated folds, in the United States, that are believed to be sources of signific... National Atlas of the United States.

50. Railroads of the United States, 2005

2005. Geological Survey (U.S.). This line shapefile represents railroads in the conterminous United States and Alaska at 1:2,000,000. This is a replacement for the December 1998 m... Geological Survey (U.S.).

51. MassGIS 2003 Massachusetts bicycle trails (January 2003)

2003. MassGIS (Office : Mass.). This dataset, formerly named "Rail Trails," was created by the Massachusetts Department of Environmental Management for the purpose of regional pla... Office of Geographic and Environmental Information (MassGIS).

52. MassGIS 2003 Massachusetts Drainage Sub-basins (Arcs) (March 2003)

2003. MassGIS (Office : Mass.). This datalayers contains arcs representing Massachusetts drainage sub-basin boundaries (see also the Drainage Sub-basins (Polygons) datalayer). Ma... Office of Geographic and Environmental Information (MassGIS).

53. MassGIS 2003 Massachusetts Hydrography (1:25,000) (Arcs) (March 2003)

2003. MassGIS (Office : Mass.). The MassGIS 1:25,000 Hydrography datalayer represents hydrographic (water-related) features, including surface water (lakes, ponds, reservoirs), we... Office of Geographic and Environmental Information (MassGIS).

54. MassGIS 2003 Massachusetts Major Drainage Basins (Arcs) (March 2003)

2003. MassGIS (Office : Mass.). This datalayer, produced by MassGIS, contains polylines representing boundaries of the 28 major drainage basins of Massachusetts as defined by the ... Office of Geographic and Environmental Information (MassGIS).

55. MassGIS 2003 Massachusetts National Wetlands Inventory (Arcs) (February 2003)

2003. MassGIS (Office : Mass.). This layer contains arcs representing rivers and streams for the state for Massachusetts. The National Wetlands Inventory (NWI) project, administe... Office of Geographic and Environmental Information (MassGIS).

56. MassGIS 2003 Massachusetts Orthophoto Streams (1:5,000) (February 2003)

2003. MassGIS (Office : Mass.). This datalayer consists of arcs representing streams and rivers in the state of Massachusetts. It is one of two datalayers that comprise the MassG... Office of Geographic and Environmental Information (MassGIS).

57. MassGIS 2003 Massachusetts Protected and Recreational Open Space (Arcs) (March 2003)

2003. MassGIS (Office : Mass.). This protected and recreational open space datalayer contains polylines representing the boundaries of conservation lands and outdoor recreational ... Office of Geographic and Environmental Information (MassGIS).

58. MassGIS 2003 Massachusetts 1:5,000 Road and Rail Centerlines (October 2002)

2002. MassGIS (Office : Mass.). The linework in this layer - representing Massachusetts roadways and railroads - was produced as part of the 1:5,000 Black and White Digital Orthop... Office of Geographic and Environmental Information (MassGIS).

59. MassGIS 2003 Massachusetts Elevation Contours (1:5,000) (September 2002)

2002. MassGIS (Office : Mass.). The Elevation Contours (1:5,000) datalayer represents 3-meter contours created from Digital Terrain Model (DTM) data points collected during the pr... Office of Geographic and Environmental Information (MassGIS).

60. MassGIS 2003 Massachusetts MHD Major Roads (December 2002)

2002. MassGIS (Office : Mass.). This datalayer represents the "major roads" in the Commonwealth from the Massachusetts Highway Department (MHD) Roads datalayer. Four classes of r... Office of Geographic and Environmental Information (MassGIS).

61. MassGIS 2003 Massachusetts Highway Department Roads (December 2002)

2001. MassGIS (Office : Mass.). This datalayer represents linework from the USGS 1:100,000 Roads Digital Line Graphs (DLGs) with additional linework from the Massachusetts Highwa... Office of Geographic and Environmental Information (MassGIS).

62. MassGIS 2003 Massachusetts Designated Shellfish Growing Areas (Arcs) (October 2000)

2000. MassGIS (Office : Mass.). The Designated Shellfish Growing Area (DSGA) datalayer was compiled by the Department of Fisheries, Wildlife and Environmental Law Enforcement's (D... Office of Geographic and Environmental Information (MassGIS).

63. MassGIS 2003 Massachusetts Hydrography (1:100,000) (Arcs) (August 2000)

2000. MassGIS (Office : Mass.). This datalayer contains arcs representing Massachusetts rivers and streams. MassGIS has adapted and modified the U.S. Geological Survey 1:100,000 ... Office of Geographic and Environmental Information (MassGIS).

64. MassGIS 2003 Massachusetts Major Watersheds (Arcs) (June 2000)

2000. MassGIS (Office : Mass.). This datalayer contains lines representing Massachusetts watershed boundaries (see also the Watersheds (Polygons) datalayer). MassGIS has produc... Office of Geographic and Environmental Information (MassGIS).

65. MassGIS 2003 Massachusetts Soil Spot Features (Arcs) (December 2000)

2000. MassGIS (Office : Mass.). This datalayer is a companion layer to the Soils (Polygons) datalayer and contains arcs representing "special" or "ad hoc" line features such as be... Office of Geographic and Environmental Information (MassGIS).

66. MassGIS 2003 Massachusetts Soils (Arcs) (December 2000)

2000. MassGIS (Office : Mass.). This datalayer contains arcs representing soil survey area boundaries for a portion of the state of Massachusetts (see also Soils (Polygons)). The... Office of Geographic and Environmental Information (MassGIS).

67. UA Census Class A Roads, 2000 - Massachusetts

2000. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays the Type A class roads thoughout the state. Feature Class A roads include: Primary roads with limited access (interstate hi... U.S. Department of Commerce, Bureau of the Census.

68. UA Census Hydrographic Features, 2000 - Massachusetts

2000. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays the hydrographic features throughout the state. This category includes shorelines of all water regardless of the classifica... U.S. Department of Commerce, Bureau of the Census.

69. UA Census Landmark Line Features, 2000 - Massachusetts

2000. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays landmark line features throughout the state. "Landmark" is the general name given to a cartographic (or locational) landmar... U.S. Department of Commerce, Bureau of the Census.

70. UA Census Miscellaneous Ground Transportation Features, 2000 - Massachusetts

2000. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays miscellaneous ground transportation features in the state. Features other than roads or railroads may be included in this l... U.S. Department of Commerce, Bureau of the Census.

71. UA Census Non-Visible Boundaries, 2000 - Massachusetts

2000. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays the non-visible features for the state. This layer contains various types of nonvisible lines used to maintain the topology... U.S. Department of Commerce, Bureau of the Census.

72. UA Census Physical Features, 2000 - Massachusetts

2000. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer represents tangible physical features throughout the state. These features are neither transportation nor hydrographic in nature but... U.S. Department of Commerce, Bureau of the Census.

73. UA Census Railroads, 2000 - Massachusetts

2000. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays a variety of railroad features for the state. Categories represented here include: Primary rail line: A railroad in this c... U.S. Department of Commerce, Bureau of the Census.

74. MassGIS 2000 Rail Trails Datalayer

1999. Massachusetts. Executive Office of Environmental Affairs. The Rail Trails Datalayer is a line coverage representing abandoned railroad rights-of-way and public bike trails that use the rights-of-way. The ... Office of Geographic and Environmental Information (MassGIS).

75. Massachusetts Major Rivers and Streams

1998. Harvard Map Collection. This datalayer is a polyline coverage displaying major streams and rivers throughout Massachusetts. This layer was derived from the Massachusetts ...

76. MassGIS 2003 Massachusetts aqueducts (July 1998)

1998. MassGIS (Office : Mass.). The Aqueducts layer contains linework representing water-transporting conduits from 1:100,000 U.S. Geological Survey Digital Line Graph (DLG) files... Office of Geographic and Environmental Information (MassGIS).

77. MassGIS 2000 Anadromous Fish Runs for Cape Cod (1997)

1997. Massachusetts. Dept. of Fisheries, Wildlife, and Environmental Law Enforcement. The Department of Fisheries, Wildlife and Environmental Law Enforcement (DFWELE) GIS Program working in conjunction with biologists from the MA Div... Office of Geographic and Environmental Information (MassGIS).

78. MassGIS 2000 Long Distance Trails

1997. Massachusetts. Dept. of Environmental Management. The Long Distance Trails Datalayer is a line coverage representing trails that are longer than 25 miles. The data was created for the purpose of re... Office of Geographic and Environmental Information (MassGIS).

79. MassGIS 2000 Massachusetts Lobster Harvest Zones, 1997 (Polylines)

1997. MassGIS (Office : Mass.). This datalayer consists of 25 distinct "statistical reporting areas" covering a large portion of the Gulf of Maine and south, including the territo... Office of Geographic and Environmental Information (MassGIS).

80. Census Class A Roads, 1995 - Massachusetts

1995. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays the Type A class roads thoughout the state. Feature Class A roads include: Primary roads with limited access (interstate hi... U.S. Department of Commerce, Bureau of the Census.

81. Census Hydrographic Features, 1995 - Massachusetts

1995. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays the hydrographic features throughout the state. This category includes shorelines of all water regardless of the classifica... U.S. Department of Commerce, Bureau of the Census.

82. Census Landmark Line Features, 1995 - Massachusetts

1995. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays landmark line features throughout the state. "Landmark" is the general name given to a cartographic (or locational) landm... U.S. Department of Commerce, Bureau of the Census.

83. Census Miscellaneous Ground Transportation Features, 1995 - Massachusetts

1995. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays miscellaneous ground transportation features in the state. Features other than roads or railroads may be included in this l... U.S. Department of Commerce, Bureau of the Census.

84. Census Non-Visible Features, 1995 - Massachusetts

1995. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays the non-visible features for the state. This layer contains various types of nonvisible lines used to maintain the topology... U.S. Department of Commerce, Bureau of the Census.

85. Census Physical Features, 1995 - Massachusetts

1995. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer represents tangible physical features throughout the state. These features are neither transportation nor hydrographic in nature but... U.S. Department of Commerce, Bureau of the Census.

86. Census Railroads, 1995 - Massachusetts

1995. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays a variety of railroad features for the state. Categories represented here include: Primary rail line: A railroad in this c... U.S. Department of Commerce, Bureau of the Census.

87. Census Unclassified Features, 1995 - Massachusetts

1995. U.S. Department of Commerce, Bureau of the Census, Geography Division. This datalayer displays the line features for the state that have not yet been identified or have been classified as unknown. All complete chains, ... U.S. Department of Commerce, Bureau of the Census.

88. Massachusetts Major Roads

1995. Harvard Map Collection. This datalayer is a polyline coverage displaying major roads throughout Massachusetts. This layer was derived from the Massachusetts Electronic At...

89. Massachusetts Transmission Lines

1995. Harvard Map Collection. This datalayer is a polyline coverage displaying non-railroad transmission lines (pipelines, powerlines and other miscellaneous transmisison line-l...

90. Fault Lines: Geology of the Conterminous United States, 2005

1994. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile represents the major fault lines in the United States. A fault is a fracture or fracture zone in the Earth's crust along which ... Geological Survey (U.S.).

91. Massachusetts Major Rivers Water Quality

1992. Harvard Map Collection. This datalayer displays a polyline coverage of major rivers in Massachusetts with associated tabular data on water quality. This dataset was origin...

92. Major Roads of the United States, 1972-1999

1972. Geological Survey (U.S.). This line shapefile portrays the major roads in the United States, Puerto Rico, and the U.S. Virgin Islands. The file was produced by joining the i... Geological Survey (U.S.).

93. Breeding Bird Survey Route Locations for Lower 48 States, 1966-1998

1966. Patuxent Wildlife Research Center. This line shapefile portrays the current routes used for conducting Breeding Bird Surveys in the lower 48 States. This layer is part of the 1997-20... National Atlas of the United States.