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Collection place
- California4 objects
- Contra Costa County, California4 objects
- North America4 objects
- San Francisco Bay Area, California4 objects
- The Americas4 objects
- United States4 objects
- CA-CCo-151, El Sobrante, Contra Costa County3 objects
- El Sobrante, Contra Costa County, California3 objects
- Unincorporated western Contra Costa County, California3 objects
- CA-CCo-146, Holland Tract, Contra Costa County1 objects
- Holland Tract, Contra Costa County, California1 objects
- Unincorporated eastern Contra Costa County, California1 objects