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Collection place
- California7 objects
- Contra Costa County, California7 objects
- North America7 objects
- San Francisco Bay Area, California7 objects
- The Americas7 objects
- United States7 objects
- Bethel Island, Contra Costa County, California6 objects
- CA-CCo-20, Bethel Island, Contra Costa County6 objects
- San Joaquin River Delta, Contra Costa County, California6 objects
- CA-CCo-151, El Sobrante, Contra Costa County1 objects
- El Sobrante, Contra Costa County, California1 objects
- Unincorporated western Contra Costa County, California1 objects