- National Atlas of the United States24
- Geological Survey (U.S.)18
- National Geophysical Data Center10
- Geological Survey (U.S.) Minerals Information Team9
- Bush, Charles A.5
- Reed, John Calvin, Jr. 1930-5
- U.S. Census Bureau. Geography Division3
- Blackburn, Laura1
- Canada Centre for Mapping1
- Gap Analysis Program (U.S.)1
- Geological Survey (U.S.). Water Resources Division. Wisconsin District1
- Godt, Jonathan W.1
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)1
- Lannoo, Michael J.1
- Nanjappa, Priya1
- Rawson, Peg1
- Rukstales, Kenneth S. (compiler)1
- Tobin, B. D.1
- United States. Agricultural Research Service1
- United States. Environmental Protection Agency1
