- North America✖Remove constraint Collection place: North America92 objects
- The Americas92 objects
- United States87 objects
- California44 objects
- Northern California24 objects
- Churchill County, Nevada21 objects
- Nevada21 objects
- Southwestern United States15 objects
- Northwestern California14 objects
- Mendocino County, California13 objects
- NV-Ch-18 (Lovelock Cave), Churchill County, Nevada11 objects
- Arizona10 objects
- Apache County, Arizona9 objects
- Central California9 objects
- Northeastern Arizona9 objects
- Ukiah Valley, Mendocino County, California9 objects
- Ukiah Rancheria, Ukiah Valley, Mendocino County8 objects
- Grimes Point Caves, Churchill County, Nevada7 objects
- NV-Ch-16 (Hidden Cave), Churchill County, Nevada7 objects
- Northwestern United States7 objects