Collection place
- Tehama County, California984 objects
- Lava fields, Siskiyou County, California952 objects
- Northwestern United States942 objects
- Southeastern United States928 objects
- CA-Sis-7, Lava fields, Siskiyou County895 objects
- Canby's Cross, Lava fields, Siskiyou County895 objects
- Rutherford area, Napa Valley, Napa County863 objects
- Trinity County, California833 objects
- Martis Valley, Placer County, California821 objects
- CA-Nap-32, Napa Valley, Napa County820 objects
- Oakley, Contra Costa County, California815 objects
- Trinity Lake, Trinity County, California815 objects
- CA-CCo-138, Oakley, Contra Costa County807 objects
- San Joaquin County, California754 objects
- Southern Great Lakes states, United States753 objects
- Humboldt Lake Bed, Pershing County, Nevada744 objects
- Santa Barbara County, California742 objects
- Humboldt Lake region, Churchill County, Nevada714 objects
- Mendocino County, California706 objects
- Northeastern United States679 objects