Spatial Coverage
- Lincoln County (Colo.)3
- Mississippi3
- Missouri3
- Nevada3
- North Carolina3
- Oklahoma3
- Otero County (Colo.)3
- Rooks County (Kan.)3
- Africa, West2
- Alaska2
- Anderson County (Tenn.)2
- Arkansas2
- Berkshire County (Mass.)2
- British Columbia2
- Cherokee Strip (Okla. and Kan.)2
- Chicago (Ill.)2
- China2
- East (U.S.)2
- Elbert County (Colo.)2
- Ellis County (Kan.)2
