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Collection place
- North America347
- The Americas347
- United States347
- California292
- North Central California215
- Northern California215
- Sacramento County, California115
- CA-Sac-107 (Windmiller Mound), Sacramento County, California103
- San Joaquin County, California96
- CA-SJo-142, San Joaquin County, California72
- San Francisco Bay Area, California67
- Contra Costa County, California65
- CA-CCo-138, Oakley, Contra Costa County54
- Oakley, Contra Costa County, California54
- Nevada45
- CA-SJo-68, San Joaquin County, California24
- Lovelock City, Pershing County, Nevada16
- Pershing County, Nevada16
- Lander County, Nevada13
- CA-CCo-250, Concord, Contra Costa County11