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Author/Creator
- Geological Survey (U.S.)565
- Maryland Geological Survey25
- Billingsley, George H.19
- Mack, Frederick K.17
- Maryland. Tidewater Administration16
- High-Sense Geophysics Limited15
- Jachens, Robert C.12
- Andreasen, David C.11
- Curtin, Stephen E.11
- Yerkes, R. F., 1923-10
- Campbell, Russell H., 1928-9
- Langenheim, Victoria E.8
- Morton, Douglas M.8
- New Hampshire. Water Division8
- Brabb, Earl E., 1929-7
- Maryland. Resource Assessment Administration7
- Schultz, Arthur P.7
- United States. Department of Energy7
- United States. National Park Service7
- AERODAT, Inc6