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Author/Creator
- Geological Survey (U.S.)106
- Maps.com (Firm)59
- Walsh, Gregory J.12
- Gardner, James V.6
- United States. Central Intelligence Agency6
- Vermont Geological Survey6
- Ensminger, Paul A.5
- Louisiana. Department of Transportation and Development. Water Resources Section5
- Massachusetts. Geological Survey5
- Huizinga, Richard J.4
- Iowa. Department of Natural Resources4
- Kohn, Michael S.4
- Linhart, S. Mike4
- Lund, Kris D.4
- Ratcliffe, Nicholas M. (Nicholas Morley), 1938-4
- United States. National Park Service4
- Aleinikoff, John Nicholas3
- New Hampshire. Geological Survey3
- Richards, Joseph M.3
- United States. Army. Corps of Engineers3