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Author/Creator
- Geological Survey (U.S.)82
- Walsh, Gregory J.13
- Vermont Geological Survey6
- Gardner, James V.5
- Maps.com (Firm)5
- Massachusetts. Geological Survey5
- National Atlas & Thematic Mapping Organisation (India)5
- Huizinga, Richard J.4
- Iowa. Department of Natural Resources4
- Kohn, Michael S.4
- Linhart, S. Mike4
- Lund, Kris D.4
- United States. National Park Service4
- Aleinikoff, John Nicholas3
- New Hampshire. Geological Survey3
- Okubo, Chris H.3
- Pandya, Kaushik3
- Paṇḍyā, Alpā Kauśika3
- Richards, Joseph M.3
- TTK Healthcare Limited. Publications Division3