1882. Geological Survey (U.S.). Chart of standard map symbols used on U.S. topographic maps.;Map on verso.;1 chart, illustrated;56 x 44 cm. U.S. Geological Survey (Washington, D.C.).
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2014. Geological Survey (U.S.). This polygon shapefile contains the county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands, by showing the counties as ar... Geological Survey (U.S.).
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.).
2014. Geological Survey (U.S.). This polygon shapefile contains the boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was created by extract... Geological Survey (U.S.).
2002. 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.).
1972. Geological Survey (U.S.). This map layer portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer was crea... U.S. Geological Survey.
1899. Geological Survey (U.S.). At head of map "Report, Public resolution No. 25, 55th Congress, 3d session."; Relief shown by contours and spot heights.; Survey in 1898.; "Map 10... U.S. Geological Survey (Washington, D.C).
1897. Geological Survey (U.S.). Relief shown by contours.; Contour interval 20 feet.; "Henry Gannet, Chief Geographer, H.M. Wilson, Geographer in charge; Topography by Frank Sutto... U.S. Geological Survey (Washington, D.C).
1902. Geological Survey (U.S.). Relief shown by contours and spot heights. 89 x 66 centimeters Scale 1:62,500 City Maps. U.S. Geological Survey (Washington).
1952. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939 and 1941. Topography by plane-table surveys 195... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).