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Collection place
- The Americas51
- North America50
- United States50
- Alaska28
- Northwestern United States28
- California22
- Northern California22
- North Central California16
- CA-Yol-13 (Mustang Mound), Yolo County, California11
- Yolo County, California11
- Northwestern California6
- Asia3
- Big Chico Creek watershed, Butte County, California2
- Butte County, California2
- CA-Sac-56 (Mosher site), Sacramento County, California2
- Chico, Butte County, California2
- China2
- East Asia2
- Sacramento County, California2
- Western Alaska2