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Collection place
- North America89 objects
- The Americas89 objects
- United States89 objects
- California84 objects
- Northern California38 objects
- Contra Costa County, California30 objects
- San Francisco Bay Area, California30 objects
- Northwestern California19 objects
- CA-CCo-138, Oakley, Contra Costa County15 objects
- Oakley, Contra Costa County, California15 objects
- Northeastern California12 objects
- Central California9 objects
- Marina Bay, Richmond, Contra Costa County9 objects
- Richmond, Contra Costa County, California9 objects
- South Central California9 objects
- Humboldt County, California7 objects
- North Central California7 objects
- CA-CCo-141, Palm Tract, Contra Costa County5 objects
- CA-CCo-295, Richmond, Contra Costa County5 objects
- Klamath River, Humboldt County, California5 objects