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- California. Department of Water Resources39
- Indiana Geological Survey16
- LeadDog Consulting (Firm)11
- Geological Survey (U.S.) Minerals Information Team8
- California Geological Survey7
- California. Division of Mines and Geology6
- Monterey County (Calif.)6
- California. Department of Conservation5
- Rosenberg, Lewis I.5
- Bernardin-Lochmueller & Associates3
- Geological Survey (U.S.)3
- Marshall, Gerald3
- Mendes, Eric3
- Arizona. State Land Department2
- Garcia, Paul2
- Hart Energy Publishing2
- Price, Matt2
- Arndt, Raymond E.1
- Bawiec, Walter J.1
- Beikman, Helen M.1