2001. Geological Survey (U.S.). This raster layer is a georeferenced image containing land cover data for the conterminous United States, in an Albers Equal-Area Conic projection ... National Geospatial Program, The National Map Small Scale.
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2007. Geological Survey (U.S.). This raster layer is a georeferenced image containing tree canopy data for the conterminous United States, in an Albers Equal-Area Conic projection... Geological Survey (U.S.).
2014. National Atlas of the United States. This polygon shapefile consists of National Wilderness Preservation System areas of 320 acres or more, in the United States, Puerto Rico, and the U... National Atlas of the United States.
1992. Geological Survey (U.S.). This raster layer is a georeferenced grid map image of land cover characteristics for North America, excluding Hawaii, and including the Caribbean ... Geological Survey (U.S.).
1992. Geological Survey (U.S.). This raster layer is a georeferenced image of 1992 land cover for the conterminous United States, at a resolution of 200 meters. The map layer was ... Geological Survey (U.S.).
2004. United States. Forest Service. This polygon shapefile is commonly called Bailey's ecoregions and shows ecosystems of regional extent in the United States, Puerto Rico, and the U.... National Atlas of the United States.
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.
1992. Wade, Tim. This raster image is a 270-meter resolution grid map of the conterminous United States in GeoTIFF format, created from National Land Cover Data (NL... National Atlas of the United States.
1992. Wade, Tim. This raster layer is a 540 meter resolution grid map of the conterminous United States in GeoTIFF format, created from National Land Cover Data (NL... National Atlas of the United States.
1992. Ritters, Kurt. This raster layer is a grid map of North America including the Caribbean and most of Mexico in GeoTIFF format. The map layer is an excerpt from a g... National Atlas of the United States.
1941. Lannoo, Michael J., Blackburn, Laura, and Nanjappa, Priya. This polygon shapefile portrays the distribution of 10 selected amphibians in the United States, based on historical literature and museum records ... National Atlas of the United States.
1972. National Atlas of the United States. This polygon shapefile contains National Wilderness Preservation System areas of 640 acres or more, in the United States, Puerto Rico, and the U.S.... National Atlas of the United States.
2003. United States. Environmental Protection Agency. This polygon shapefile shows Omernik's Level III ecoregions, derived from a 1:7,500,000 map created by J.M. Omernik in 1987 and from refinements of... National Atlas of the United States.
1990. United States. Agricultural Research Service. This polygon shapefile portrays the spread, by year, of the Africanized honey bee (AHB) in the United States, Puerto Rico, and the U.S. Virgin Isla... National Atlas of the United States.
