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- U.S. Geological Survey254
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- Ministère de la Défense Nationale60
- The Survey59
- Directorate of Overseas Surveys for the Tanganyika Government14
- Instituto Geográfico e Cadastral13
- United States, Dept. of the Interior, Geological Survey12
- Directorate of Overseas Surveys for the Government of Tanganyika11
- Geological Survey of Canada10
- Geological Survey of Alabama6
- For sale by the Survey4
- Instituto Geográfico Militar4
- The Office4
- Geological Survey3
- Interior--Geological Survey3
- National Geographic Society3
- The Co.3
- Dept. of the Interior, U.S. Geological Survey2
- IGN2
- Survey Division Ministry of Lands, Forests, & Wildlife, Tanganyika2
