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31. County Boundaries of the United States, 1980

1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

32. County Boundaries of the United States, 1990

1990. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).

33. County Boundaries of the United States, 2000

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.).

34. Electric power transmission, 1974

Geological Survey (U.S.). U.S. Geological Survey,.

35. Forest Cover Types, United States, 2002

2002. United States. Forest Service and Geological Survey (U.S.). This raster layer portrays general forest cover types for the United States in GeoTIFF format. Data were derived from Advanced Very High Resolution... National Atlas of the United States.

36. Geologic quadrangle map /

Geological Survey (U.S.). U.S. Geological Survey,.

37. Geologic quadrangle map /

Geological Survey (U.S.). U.S. Geological Survey,.

38. Geologic quadrangle maps of the United States

Geological Survey (U.S.). U.S. Geological Survey,.

39. Geology of the conterminous United States at 1:2,500,000 scale a digital representation of the 1974 P.B. King and H.M. Beikman map /

Geological Survey (U.S.). The Survey ;.

40. Global Map: 1:1,000,000-Scale Inland Water Areas of the United States, 2014

2014. Geological Survey (U.S.). This polygon shapefile includes Global Map data showing waterbodies and wetlands of the United States, Puerto Rico, and the U.S. Virgin Islands. Th... Geological Survey (U.S.).