Spatial Coverage
- Boyle County (Ky.)1
- Brewster (Wash.)1
- Brewster County (Tex.)1
- Brewster County.1
- Bridgeport (Wash.)1
- British Columbia1
- Bronx (New York, N.Y.)1
- Bullfrog Mining District (Nev.)1
- Buncombe County1
- Burma1
- Butte1
- Butte (Mont.)1
- Butte County1
- California.1
- Cambria County1
- Camp Meeker (Calif.)1
- Canada1
- Canada, Western1
- Canal Zone1
- Carroll County (Ark.)1
