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Collection place
- North America[remove]8
- The Americas8
- United States8
- California5
- San Francisco Bay Area, California3
- CA-CCo-151, El Sobrante, Contra Costa County2
- Contra Costa County, California2
- El Sobrante, Contra Costa County, California2
- Nevada2
- Northern California2
- Unincorporated western Contra Costa County, California2
- Alameda County, California1
- Alaska1
- Arroyo Mocho, Alameda County, California1
- CA-Ala-28 (McCoy site), Arroyo Mocho, Alameda County1
- CA-Las-74, Lassen County, California1
- CA-Yol-13 (Mustang Mound), Yolo County, California1
- Churchill County, Nevada1
- Humboldt Lake region, Churchill County, Nevada1
- Lassen County, California1