Spatial Coverage
- Harrison Bay (Alaska)1
- Hart County1
- Hartford County1
- Hawaii Volcanoes National Park1
- Hawaii.1
- Hayward Fault (Calif.)1
- Herkimer County (N.Y.)1
- Hevelius Region1
- Hickman County1
- Hinsdale County1
- Honduras1
- Horwood, Lake, Region1
- Houston County1
- Houston County (Ala.)1
- Humboldt County1
- Illinois1
- Illinois.1
- Indochina1
- Iowa1
- Iran1
