Collection place
- California224 objects
- North America224 objects
- The Americas224 objects
- United States224 objects
- San Francisco Bay Area, California142 objects
- Contra Costa County, California84 objects
- Northern California75 objects
- Northeastern California65 objects
- CA-Sis-262 (Foster site), Bogus Creek, Siskiyou County64 objects
- Siskiyou County, California64 objects
- Bethel Island, Contra Costa County, California56 objects
- CA-CCo-20, Bethel Island, Contra Costa County56 objects
- San Joaquin River Delta, Contra Costa County, California56 objects
- Napa County, California46 objects
- Berryessa Valley, Napa County, California45 objects
- CA-CCo-14, El Sobrante, Contra Costa County25 objects
- El Sobrante, Contra Costa County, California25 objects
- Unincorporated western Contra Costa County, California25 objects
- CA-Nap-89, Berryessa Valley, Napa County23 objects
- CA-Nap-93, Berryessa Valley, Napa County22 objects