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- Geological Survey (U.S.)237
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- United States. Central Intelligence Agency30
- United States. National Oceanic and Atmospheric Administration22
- Valentine, Page C.20
- Baker, Jessica L.17
- Unger, Tanya S.17
- National Atlas & Thematic Mapping Organisation (India)12
- AM (Publisher)11
- Adam Matthew Digital (Firm)11
- Newberry Library11
- Great Britain. Colonial Office10
- National Archives (Great Britain)10
- State Geological and Natural History Survey of Connecticut10
- Nag, Prithvish9
- Ryder, Robert T.8
- Soler-LoĢpez, Luis R.8
- Stone, Byron D.8
- United States. Bureau of the Census8
- Carrara, Paul E.7