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- Geographic Data Technology, Inc. (GDT)52
- Esri8
- National Atlas of the United States and the United States Geological Survey6
- Environmental Systems Research Institute (Redlands, Calif.)5
- Environmental Systems Research Institute, Inc. (ESRI)3
- U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency3
- Geological Survey (U.S.)2
- National Atlas of the United States2
- United States. Environmental Protection Agency2