- Bush, Charles A.5
- Canada Centre for Mapping1
- EROS Data Center2
- Environmental Systems Research Institute (Redlands, Calif.)7
- Gap Analysis Program (U.S.)2
- Geological Survey (U.S.)35
- Geological Survey (U.S.). Water Resources Division. Wisconsin District1
- Global Resource Information Database1
- Hijmans, Robert J.2
- Institute for Water Resources (U.S.). Navigation Data Center1
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)1
- National Atlas of the United States33
- National Energy Information Center (U.S.)1
- National Geophysical Data Center8
- Rawson, Peg2
- Reed, John Calvin, Jr. 1930-5
- Ritters, Kurt1
- Stackhouse, Cecil17
- Strocko, Ed1
- U.S. Census Bureau. Geography Division2
