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- U.S. Geological Survey112
- Interior-Geological Survey63
- The Survey53
- United States, Dept. of the Interior, Geological Survey52
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- The Center17
- Dept. of the Interior, U.S. Geological Survey8
- Geological Survey of Canada8
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- El Instituto4
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- Missouri Dept. of Natural Resources, Missouri Geological Survey3
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- Geological Survey2
- Geological Survey of Alabama2
- IGN2
- Institut Géographique National2
- Instituto de Geociências, Universidade Federal do Rio Grande do Sul2
