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31. Effingham quadrangle, Illinois : 15 minute series (topographic)

Maps University Of Illinois Urbana Champaign Public content
1951. Geological Survey (U.S.). Contour interval 10 feet;"Culture and drainage in part compiled from aerial photographs taken 1938-1939. Topography by plane-table methods 1949-195... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

32. Erie quadrangle, Illinois : 15 minute series (topographic)

Maps University Of Illinois Urbana Champaign Public content
1953. Geological Survey (U.S.). Contour interval 10 feet.;"Topography from aerial photographs by Kelsh plotter and by plane-table surveys 1952. Aerial photographs taken 1951";Reli... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

33. Fairfield quadrangle, Illinois : 15 minute series (topographic)

Maps University Of Illinois Urbana Champaign Public content
1948. Geological Survey (U.S.). Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods 1946.;Contour interval 20 feet.;Coordin... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

34. Flanagan quadrangle, Illinois : 15 minute series (topographic)

Maps University Of Illinois Urbana Champaign Public content
1958. Geological Survey (U.S.). Culture and drainage in part compiled from aerial photographs taken 1951. Topography by planetable surveys 1957-1958.;Contour interval 10 feet.;Rel... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

35. Flora quadrangle, Illinois : 15 minute series (topographic)

Maps University Of Illinois Urbana Champaign Public content
1949. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods 1947-1948.";... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

36. Fort Bayard

Maps University Of Minnesota Public content
1910. Geological Survey (U.S.). Relief shown by contours and spot heights.; Surveyed in 1908.; Alternate title: New Mexico (Grant County), Fort Bayard special map.; R.B. Marshall,... U.S. Geological Survey (Washington, D.C).

37. Geologic map of Dead River area, Michigan

Maps University Of Minnesota Public content
1910. Geological Survey (U.S.). Relief shown by hachures.; Printed by A. Hoen & Co., Baltimore. 32 x 51 Centimeters Scale 1:62,500 General Map Collection. The Survey (Washington, D.C).

39. Geologic map of the Lake Superior region, with sections

Maps University Of Minnesota Public content
1910. Geological Survey (U.S.). Marginal legend and cross sections. "Base map compiled by the U. S. Geological Survey from U. S. Geological Survey atlas sheets, Land Office reco... U.S. Geological Survey (Washington, D.C.?).