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Collection place
- The Americas1,908
- North America1,879
- United States1,716
- California1,069
- San Francisco Bay Area, California644
- Nevada520
- CA-SMa-151 (Phleger Mound), Princeton, San Mateo County385
- Half Moon Bay, San Mateo County, California385
- Princeton, San Mateo County, California385
- San Mateo County, California385
- Northern California350
- Africa311
- Northeastern California300
- CA-Las-194, Surprise Valley, Lassen County278
- Lassen County, California278
- Surprise Valley, Lassen County, California278
- Egypt216
- Northern Africa216
- Nile River Valley, Egypt215
- Napa County, California197