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- Geological Survey (U.S.)446
- Tanzania. Idara ya Upimaji na Ramani19
- United States. Central Intelligence Agency16
- Berge Exploration Inc11
- Geological Services of Tulsa8
- United States. Bureau of Indian Affairs. Phoenix Area Office. Branch of Roads8
- Canadian Hydrographic Service7
- United States. Bureau of Land Management5
- National Geographic Society (U.S.). Cartographic Division4
- Newfoundland. Mineral Development Division4
- United States. Forest Service. Eastern Region4
- United States. Defense Mapping Agency. Hydrographic/Topographic Center3
- Dahlberg, Richard E.2
- Kentucky Geological Survey2
- National Wetlands Inventory (U.S.)2
- United States. Bureau of Indian Affairs. Minneapolis Area. Branch of Roads2
- United States. Forest Service. Northern Region2
- United States. Forest Service. Rocky Mountain Region2
- Canada. Mapping and Charting Establishment1
- Chicago Transit Authority1
