Collection place
- Japan184
- Inyo County, California180
- British Columbia, Canada178
- Klamath River, Humboldt County, California175
- Round Valley, Mendocino County, California174
- Northern Africa168
- Pershing County, Nevada166
- Peru165
- Churchill County, Nevada164
- Central Mexico154
- Luzon island group, Philippines154
- Southeastern California147
- Egypt143
- Central Africa136
- Japanese archipelago, Japan131
- NV-Pe-12, Pershing County, Nevada128
- Kern County, California125
- Riverside County, California123
- Southwestern California121
- Western Washington121