Collection place
- Shasta County, California992 objects
- Tehama County, California987 objects
- Lava fields, Siskiyou County, California952 objects
- Southeastern United States940 objects
- San Joaquin County, California920 objects
- CA-Sis-7, Lava fields, Siskiyou County895 objects
- Canby's Cross, Lava fields, Siskiyou County895 objects
- Santa Barbara County, California878 objects
- Rutherford area, Napa Valley, Napa County863 objects
- Mendocino County, California840 objects
- Trinity County, California833 objects
- Southern Great Lakes states, United States829 objects
- Martis Valley, Placer County, California821 objects
- CA-Nap-32, Napa Valley, Napa County820 objects
- Oakley, Contra Costa County, California816 objects
- Trinity Lake, Trinity County, California815 objects
- CA-CCo-138, Oakley, Contra Costa County808 objects
- Humboldt Lake Bed, Pershing County, Nevada744 objects
- Northeastern United States737 objects
- Humboldt Lake region, Churchill County, Nevada719 objects