- California26 objects
- North America26 objects
- Northeastern California26 objects
- Northern California26 objects
- Northern Sierras, Northern California✖Remove constraint Collection place: Northern Sierras, Northern California26 objects
- The Americas26 objects
- United States26 objects
- Amador County, California11 objects
- CA-Ama-3 (Bamert Cave), Amador County, California11 objects
- El Dorado County, California10 objects
- South Fork of American River, El Dorado County, California9 objects
- CA-Cal-83, Calaveras County, California2 objects
- CA-Nev-15, Nevada County, California2 objects
- Calaveras County, California2 objects
- Nevada County, California2 objects
- San Juan Ridge, Nevada County, California2 objects
- CA-ElD-16 (Hawver Cave), El Dorado County, California1 objects
- CA-Pla-39, Placer County, California1 objects
- Placer County, California1 objects