Collection place
- Lassen County, California10 objects
- Northern Channel Islands, Santa Barbara County, California9 objects
- Richmond, Contra Costa County, California9 objects
- Santa Rosa Island, Santa Barbara Channel Islands, Southern California9 objects
- Topanga Canyon, Santa Monica Mountains, Los Angeles County9 objects
- Central Mexico8 objects
- Jalisco, Mexico8 objects
- Mexico8 objects
- West-Central Mexico8 objects
- CA-CCo-284, Richmond, Contra Costa County7 objects
- CA-Las-194, Surprise Valley, Lassen County7 objects
- Potrero San Pablo, Richmond, Contra Costa County7 objects
- Surprise Valley, Lassen County, California7 objects
- South Central California6 objects
- Modoc County, California5 objects
- Nevada5 objects
- Siskiyou County, California5 objects
- Tuxcacuesco Municipality, Jalisco, Mexico5 objects
- Alameda County, California4 objects
- CA-CCo-259, Rodeo, Contra Costa County4 objects