Subject
- Historical geography1
- Homestead law1
- Indian land transfers1
- Indian reservations1
- Indians of North America1
- Lignite1
- Oil wells1
- Outdoor recreation1
- Paleozoic Geologic Period1
- Physical geography1
- Precambrian Geologic Period1
- Real estate business1
- Remote sensing1
- Soils1
- Stream measurements1
- Vegetation mapping1
- Water quality1
- Water resources management1
- Water table1
- Water-supply1
