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Author/Creator
- Maps.com (Firm)11
- Geological Survey (U.S.)9
- Andreasen, David C.4
- Curtin, Stephen E.4
- Mack, Frederick K.4
- Maryland Geological Survey4
- Maryland. Resource Assessment Administration4
- Bower, David E.1
- Christiansen, Robert L.1
- George Philip & Son1
- Hittle, Clinton1
- Kidry, Paul1
- Lund, Karen1
- Oxford University Press1
- Pratchett, Terry1
- South Carolina. Department of Health and Environmental Control1
- South Dakota. Department of Environment and Natural Resources1
- South Florida Water Management District (Fla.)1
- Strobel, Michael L.1
- United States. Natural Resources Conservation Service1