Creator
- Geological Survey (U.S.) Minerals Information Team7
- National Atlas of the United States5
- Geological Survey (U.S.)4
- Applied Science Associates1
- Coastal Services Center (U.S.)1
- Geological Survey (U.S.). Water Resources Division. Wisconsin District1
- Nature Conservancy (U.S.)1
- U.S. Fish and Wildlife Service1
- United States. Agricultural Research Service1
- United States. Environmental Protection Agency1
- United States. National Ocean Service1
- United States. National Oceanic and Atmospheric Administration1