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- Raymond, W. (Walter)11
- Whitcomb, I. A.11
- Hutchings, J. M. (James Mason), 1820-190210
- Southern Pacific Company8
- Woodbridge, Sally Byrne7
- California Coastal Commission6
- California. Department of Fish and Game6
- International Geological Congress (28th : 1989 : Washington, D.C.)6
- Raymond-Whitcomb, Inc6
- Union Pacific Railroad Company6
- American Geophysical Union5
- Higgins, C. A. (Charles A.)5
- Society of Economic Paleontologists and Mineralogists. Pacific Section5
- United States. National Park Service5
- Woodbridge, John Marshall5
- Adam Matthew Digital (Firm), digitiser4
- Federal Writers' Project of the Works Progress Administration of Northern California4
- Gebhard, David4
- Stillson, Richard T. (Richard Thomas)4
- A.L. Bancroft & Company3