- North America156 objects
- The Americas156 objects
- United States156 objects
- California144 objects
- Modoc County, California144 objects
- Northeastern California144 objects
- Northern California144 objects
- Surprise Valley, Modoc County, California144 objects
- CA-Mod-204, Modoc County, California107 objects
- CA-Mod-203, Modoc County, California35 objects
- Nevada12 objects
- Washoe County, Nevada12 objects
- NV-Wa-191, Washoe County, Nevada4 objects
- NV-Wa-194, Washoe County, Nevada3 objects
- CA-Mod-227, Modoc County, California2 objects
- NV-Wa-192, Washoe County, Nevada2 objects
- NV-Wa-1502 (Hanging Rock Shelter), Washoe County, Nevada1 objects
- NV-Wa-185, Washoe County, Nevada1 objects
- NV-Wa-196, Washoe County, Nevada1 objects