- California34 objects
- North America34 objects
- The Americas34 objects
- United States✖Remove constraint Collection place: United States34 objects
- Northeastern California26 objects
- Northern California26 objects
- Siskiyou County, California17 objects
- Modoc County, California9 objects
- Lower Klamath Lake Area, Siskiyou County, California8 objects
- Lower Klamath Lake, Siskiyou County, California8 objects
- Napa County, California8 objects
- San Francisco Bay Area, California8 objects
- CA-Nap-1 (Goddard Mound), Napa Valley, Napa County7 objects
- Middle Napa Valley, Napa County, California7 objects
- Napa Valley, Napa County, California7 objects
- Oakville area, Napa Valley, Napa County7 objects
- CA-Mod-27, Modoc County, California6 objects
- Lava fields, Siskiyou County, California4 objects
- Southern Lower Klamath Lake, Siskiyou County, California4 objects
- Tule Lake, Siskiyou County, California4 objects