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- California. State Water Resources Control Board32
- Geological Survey (U.S.)22
- Geological Survey (U.S.), issuing body19
- Belitz, Kenneth18
- Ground Water Ambient Monitoring and Assessment Program (Calif.)8
- California. Department of Water Resources5
- Fram, Miranda S. (Miranda Susan)5
- California. Central Valley Regional Water Quality Control Board4
- Martin, Peter, 1953-4
- Milby Dawson, Barbara J., 1964-4
- United States. Congress. House. Committee on Government Operations. Conservation and Natural Resources Subcommittee4
- Alpers, Charles N., 1958-3
- Bennett, George L.3
- California. Dept. of Water Resources3
- Hamlin, Scott N.3
- Kulongoski, Justin3
- National Science Foundation (U.S.)3
- United States. Congress. House. Committee on Interior and Insular Affairs. Subcommittee on Water and Power Resources3
- United States. Congress. House. Committee on Natural Resources. Subcommittee on Water and Power3
- United States. Department of the Army. National Training Center3