Collection place
- Mexico12 objects
- Middle Napa Valley, Napa County, California12 objects
- Dordogne (department), Nouvelle-Aquitaine, France11 objects
- Europe11 objects
- France11 objects
- Lava fields, Siskiyou County, California11 objects
- Modoc County, California11 objects
- Nouvelle-Aquitaine, France11 objects
- Secret Valley, Lassen County, California11 objects
- Western Europe11 objects
- CA-Las-21, Secret Valley, Lassen County10 objects
- Central California coast10 objects
- Central Africa9 objects
- Jafota, Zambia9 objects
- Lower Klamath Lake Area, Siskiyou County, California9 objects
- Lower Klamath Lake, Siskiyou County, California9 objects
- Marin County, California9 objects
- Zambia9 objects
- CA-Iny-2, Inyo County, California8 objects
- Northern Mexico8 objects