- North America✖Remove constraint Collection place: North America44 objects
- The Americas44 objects
- United States40 objects
- California25 objects
- Northern California18 objects
- Northwestern California10 objects
- Northeastern California8 objects
- Nevada5 objects
- Northwestern United States5 objects
- Southwestern United States5 objects
- Great Plains, North America4 objects
- Modoc County, California4 objects
- Surprise Valley, Modoc County, California4 objects
- Arizona3 objects
- Central California3 objects
- Central Oregon3 objects
- Churchill County, Nevada3 objects
- Klamath County, Oregon3 objects
- Klamath Reservation, Klamath County, Oregon3 objects
- NV-Ch-18 (Lovelock Cave), Churchill County, Nevada3 objects