- North America164 objects
- The Americas164 objects
- United States164 objects
- California163 objects
- Modoc County, California163 objects
- Northeastern California163 objects
- Northern California163 objects
- Surprise Valley, Modoc County, California159 objects
- CA-Mod-204, Modoc County, California151 objects
- CA-Mod-202, Modoc County, California7 objects
- CA-Mod-241, Modoc County, California4 objects
- CA-Mod-243, Modoc County, California1 objects
- NV-Wa-183, Washoe County, Nevada1 objects
- Nevada1 objects
- Washoe County, Nevada1 objects