- California1,352 objects
- North America1,352 objects
- Northern California✖Remove constraint Collection place: Northern California1,352 objects
- The Americas1,352 objects
- United States1,352 objects
- Northeastern California913 objects
- Lassen County, California603 objects
- North Central California380 objects
- Eagle Lake, Lassen County, California166 objects
- Tehama County, California124 objects
- Modoc County, California119 objects
- Sacramento County, California103 objects
- Lake County, California93 objects
- Siskiyou County, California90 objects
- CA-Teh-1 (Kingsley Cave), Tehama County, California79 objects
- Shasta County, California69 objects
- Northwestern California59 objects
- Surprise Valley, Modoc County, California49 objects
- CA-Mod-27, Modoc County, California47 objects
- Mendocino County, California44 objects