Collection place
- California14 objects
- North America14 objects
- The Americas14 objects
- United States14 objects
- San Francisco Bay Area, California13 objects
- Contra Costa County, California12 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, California2 objects
- CA-CCo-20, Bethel Island, Contra Costa County2 objects
- San Joaquin River Delta, Contra Costa County, California2 objects
- Alameda County, California1 objects
- Berkeley, Alameda County, California1 objects
- CA-Ala-307, Berkeley, Alameda County1 objects
- CA-CCo-151, El Sobrante, Contra Costa County1 objects
- CA-Sac-168 (Erich site), Sacramento County, California1 objects
- North Central California1 objects
- Northern California1 objects
- Sacramento County, California1 objects