Collection place
- Palisade Creek, Fresno County, California1 objects
- Palm Tract, Contra Costa County, California17 objects
- Panamint Range, Inyo County, California8 objects
- Parnassus Heights, San Francisco, San Francisco County5 objects
- Partington Ridge, Monterey County, California1 objects
- Paso de Ovejas, Veracruz, Mexico3 objects
- Patrick's Point, Humboldt County, California5 objects
- Peeple's Valley, Yavapai County, Arizona1 objects
- Pelican Bay, Upper Klamath Lake, Klamath Lake1 objects
- Peninsula Bay, Tule Lake, Siskiyou County4 objects
- Pennsylvania86 objects
- Peny County, Missouri1 objects
- Perry County, Pennsylvania1 objects
- Pershing County, Nevada1,197 objects
- Peru243 objects
- Perugia, Umbria, Central Italy4 objects
- Petaluma Valley, Sonoma County, California2 objects
- Petaluma, Sonoma County, California2 objects
- Peter Plantation, Jefferson County, Kentucky13 objects
- Petes Valley, Lassen County, California98 objects