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Collection place
- California17 objects
- North America17 objects
- The Americas17 objects
- United States17 objects
- San Francisco Bay Area, California16 objects
- Contra Costa County, California15 objects
- El Sobrante, Contra Costa County, California10 objects
- Unincorporated western Contra Costa County, California10 objects
- CA-CCo-14, El Sobrante, Contra Costa County9 objects
- Bethel Island, Contra Costa County, California4 objects
- CA-CCo-20, Bethel Island, Contra Costa County4 objects
- San Joaquin River Delta, Contra Costa County, California4 objects
- Berryessa Valley, Napa County, California1 objects
- CA-CCo-151, El Sobrante, Contra Costa County1 objects
- CA-CCo-229, Danville, Contra Costa County1 objects
- CA-Nap-89, Berryessa Valley, Napa County1 objects
- CA-Sac-168 (Erich site), Sacramento County, California1 objects
- Danville, Contra Costa County, California1 objects
- Napa County, California1 objects
- North Central California1 objects