Collection place
- California1,729 objects
- North America1,729 objects
- The Americas1,729 objects
- United States1,729 objects
- San Francisco Bay Area, California1,381 objects
- Contra Costa County, California1,376 objects
- CA-CCo-138, Oakley, Contra Costa County1,338 objects
- Oakley, Contra Costa County, California1,338 objects
- North Central California348 objects
- Northern California348 objects
- San Joaquin County, California336 objects
- CA-SJo-142, San Joaquin County, California213 objects
- CA-SJo-68, San Joaquin County, California91 objects
- Unincorporated eastern Contra Costa County, California24 objects
- Byron Tract, Contra Costa County, California17 objects
- CA-CCo-145, Byron Tract, Contra Costa County17 objects
- San Joaquin River Delta, Contra Costa County, California14 objects
- CA-SJo-145, San Joaquin County, California13 objects
- CA-SJo-NL-4, Union Island, San Joaquin County13 objects
- Union Island, San Joaquin County, California13 objects