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Author/Creator
- Maps.com (Firm)86
- Geological Survey (U.S.)61
- United States. Central Intelligence Agency16
- Adam Matthew Digital (Firm)10
- Cochran, Susan A. (Susan Allene)10
- Great Britain. Colonial Office9
- National Archives (Great Britain)9
- Johnson, Samuel Y.6
- U.S. Census Bureau5
- Appalachian Regional Commission4
- Dartnell, Peter4
- U.S. Census Bureau. Geography Division4
- United States. Central Intelligence Agency. Cartography Center4
- California State Coastal Conservancy3
- United States. Bureau of the Census3
- Coastal and Marine Geology Program (Geological Survey)2
- Cochrane, Guy R.2
- Llano Estacado Underground Water Conservation District (Tex.)2
- Morton, Robert A.2
- New Mexico. Office of the State Engineer2