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Author
- Digital Social Science Center (DSSC), Columbia University Libraries9
- Geological Survey (U.S.)[remove]9
- Baker, Marcus, 1849-1903.1
- Bowman, Isaiah, 1878-1950.1
- Clark, William Bullock, 1860-1917.1
- Dahl, Thomas E.1
- Gannett, Henry, 1846-1914.1
- Geological Survey of Maryland.1
- Julius Bien & Co.1
- Maryland Geological Survey.1
- National Wetlands Inventory (U.S.)1
- U.S. Fish and Wildlife Service.1
- United States. Bureau of Soils.1
- Veatch, A. C. (Arthur Clifford), 1878-1938.1