2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
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1928. Geological Survey (U.S.). Surveyed in 1925.; Relief shown by contours, shading, and spot heights.; Shows roads, campgrounds, tunnel, waterholes, caves and other natural feat... U.S. Geological Survey (Washington, D.C).
1949. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939. Topography by plane-table methods 1946.";Relie... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1949. Geological Survey (U.S.). Contour interval 10 feet.;Relief shown by contours and spot heights. -- "Culture and drainage in part compiled from aerial photographs taken 1940. ... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1908. Geological Survey (U.S.). Relief shown by contours and spot heights on region map.; Battlefield map is intended to show the field as it was at or about the time of the battl... The Survey (Washington, D.C).
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.";Relief... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1924. Geological Survey (U.S.). Relief shown by contours and spot heights.; "Surveyed in 1903 and 1923."; "State of Colorado, William E. Sweet, Governor ..." on sheet 59 x 84 cent... The Survey (Washington, D.C).
1900. Geological Survey (U.S.). 1 map : col. ; 45 x 72 cm on sheet 51 x 78 cm At top of sheet: U.S. Geological survey. Seventeenth annual report, Part I, Pl. II.
1909. Geological Survey (U.S.). 130 x 175 centimeters Scale 1:125,000. General Minnesota Maps. U.S. Geological Survey, (Washington).
1950. Geological Survey (U.S.). Contour interval 10 feet;"Culture and drainage in part compiled from aerial photographs taken 1948. Topography by plane-table methods 1948.";Relief... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).