- North America✖Remove constraint Collection place: North America15 objects
- The Americas15 objects
- United States15 objects
- Nevada12 objects
- Churchill County, Nevada11 objects
- NV-Ch-18 (Lovelock Cave), Churchill County, Nevada11 objects
- California2 objects
- Northeastern California2 objects
- Northern California2 objects
- Alaska1 objects
- Amador County, California1 objects
- CA-Ama-3 (Bamert Cave), Amador County, California1 objects
- CA-Las-90 (Amedee Cave), Lassen County, California1 objects
- Lassen County, California1 objects
- NV-Wa-NL-3, Washoe County, Nevada1 objects
- Northern Sierras, Northern California1 objects
- Northwestern United States1 objects
- Washoe County, Nevada1 objects