Creator
- Geological Survey (U.S.)30
- National Atlas of the United States27
- National Geophysical Data Center8
- Bush, Charles A.5
- Reed, John Calvin, Jr. 1930-5
- EROS Data Center2
- United States. Forest Service2
- Canada Centre for Mapping1
- Geological Survey (U.S.). Water Resources Division. Wisconsin District1
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)1
- Ritters, Kurt1
- USGS National Center for EROS1
- United States. Agricultural Research Service1
- United States. Minerals Management Service1