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Author
- Geological Survey (U.S.)2
- Byers, Virginia P.1
- Geological Survey (U.S.). National Mapping Division1
- Popenoe, Peter1
- United States. Bureau of the Census. Geography Division1
- United States. Forest Service. Eastern Region1
- United States. Forest Service. Intermountain Region1
- United States. Forest Service. Northern Region1
- Whitehead, R. L., author1
