Collection place
- Rajasthan, India1 objects
- Rancheria La Huerta, San Rafael Valley, Ensenada municipality1 objects
- Rancho Cordova, Sacramento County, California2 objects
- Red Lake, Coconino County, Arizona2 objects
- Redding, Shasta County, California12 objects
- Redwood Creek, Humboldt County, California1 objects
- Republic of Botswana17 objects
- Republic of South Africa7 objects
- Republic of the Congo4 objects
- Requa, Klamath (CDP), Del Norte County5 objects
- Resolute Bay, Queen Elizabeth Islands, Nunavut2 objects
- Richmond Annex, Richmond, Contra Costa County1 objects
- Richmond, Contra Costa County, California491 objects
- Rio Andirá, Brazil24 objects
- Riverside County, California8 objects
- Rodellas, Bahia State, Brazil2 objects
- Rodeo, Contra Costa County, California2 objects
- Rogue River, Southwestern Oregon, Western Oregon2 objects
- Round Valley, Mendocino County, California48 objects
- Ruin-field M, El Hasa Region, Saudi Arabia1 objects