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- United States. Bureau of the Census. Geography Division58
- Maps.com (Firm)47
- United States. Bureau of the Census44
- Geological Survey (U.S.)40
- U.S. Census Bureau11
- United States. Bureau of the Census. Data Preparation Division11
- U.S. Census Bureau. Geography Division7
- United States. Bureau of the Census. Population Division7
- United States. Bureau of the Census. Agriculture Division6
- Cress, Jill J. (Jill Janene)4
- NatureServe (Program)4
- United States. Bureau of Transportation Statistics4
- Archer, J. Clark3
- United States. Environmental Protection Agency3
- United States. National Oceanic and Atmospheric Administration3
- United States. National Park Service3
- Adam Matthew Digital (Firm)2
- Biewick, Laura H.2
- Carnes, Mark C. (Mark Christopher), 1950-2
- DeFranco, Laurence J.2