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- Geological Survey (U.S.)463
- United States. Central Intelligence Agency24
- Tanzania. Idara ya Upimaji na Ramani18
- United States. Forest Service. Eastern Region18
- United States. Bureau of Land Management. California Desert District7
- National Geographic Society (U.S.). Cartographic Division6
- National Wetlands Inventory (U.S.)6
- Zambia. Survey Dept6
- Nelson, W. John3
- United States. Forest Service. Northern Region3
- United States. Forest Service. Southwestern Region3
- United States. National Ocean Service3
- United States. Bureau of Land Management2
- United States. Bureau of the Census. Geography Division2
- United States. Forest Service2
- Aghanabati, A.1
- Barnett, Robert L.1
- Barr, G. L.1
- Benson, Richard N.1
- Bluemle, John P.1
