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- California. Division of Mines and Geology9
- California Geological Survey4
- Falteisek, Jan4
- Allegheny County Division of Computer Services Geographic Information Systems Group3
- Arizona. State Land Department3
- United States Geological Survey3
- Hemstad, Chris B.2
- Lusardi, Barbara A.2
- Ojakangas, Richard W.2
- Southwick, David L.2
- Boerboom, Terrence J.1
- California. Department of Fish and Game. Marine Resources Region1
- Circuit Rider Productions1
- Food and Agriculture Organization of the United Nations1
- Geological Survey (U.S.)1
- Hobbs, Howard C.1
- Holm, Daniel K.1
- Meints, Joyce P.1
- Meyer, Gary N.1
- Morey, G.B.1