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- J. Paul Getty Museum47
- California. Division of Mines22
- ebrary, Inc19
- Geological Survey (U.S.)18
- Project Muse15
- Adam Matthew Digital (Firm), digitiser12
- California State Mining Bureau12
- California. Division of Mines and Geology12
- California10
- Naef, Weston J., 1942-10
- Olken, Charles E.10
- Palmquist, Peter E.10
- Roby, Norman S.10
- Thompson, Bob, 1934-10
- San Francisco Museum of Modern Art9
- American Chemical Society. Division of Environmental Chemistry, sponsoring body7
- National Water-Quality Assessment Program (U.S.)6
- Southworth, May E. (May Elizabeth)6
- Weston, Edward, 1886-19586
- Book Club of California5