Spatial Coverage
- Gulf Coast1
- Gulf Coast.1
- Gulf Region.1
- Gulf States1
- Hardeman County (Tex.)1
- Harding County1
- Harding County (N.M.)1
- Harding County.1
- Harris-Galveston Coastal Subsidence District (Tex.)1
- Hays County1
- High Plains (U.S.)1
- Highland Lakes1
- Holland (Tex.)1
- Houston County1
- Houston County (Tex.)1
- Hudspeth County1
- Illinois1
- Illinois.1
- Iowa1
- Iowa.1
