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Collection place
- California6 objects
- North America6 objects
- The Americas6 objects
- United States6 objects
- San Francisco Bay Area, California4 objects
- Contra Costa County, California3 objects
- Bethel Island, Contra Costa County, California2 objects
- CA-CCo-20, Bethel Island, Contra Costa County2 objects
- Colusa County, California2 objects
- North Central California2 objects
- Northern California2 objects
- San Joaquin River Delta, Contra Costa County, California2 objects
- Alameda County, California1 objects
- CA-Ala-329 (Ryan Mound), Coyote Hills, Fremont1 objects
- CA-CCo-141, Palm Tract, Contra Costa County1 objects
- CA-Col-2 (Howell's Point), Colusa County, California1 objects
- CA-Col-3 (Sandhill site), Colusa County, California1 objects
- Fremont, Alameda County, California1 objects
- Palm Tract, Contra Costa County, California1 objects
- Unincorporated eastern Contra Costa County, California1 objects