Subject
- Oil fields2
- Oil wells2
- Petroleum2
- Airways1
- Barometric hypsometry1
- Census districts1
- Choctaw Indians1
- Computer simulation1
- Depth-area-duration (Hydrometeorology)1
- Digital techniques1
- Discoveries in geography1
- Discovery and exploration1
- Erosion1
- Federal aid to transportation1
- Floods1
- Geographic information systems1
- Geomagnetism1
- Geomorphology1
- Gravity anomalies1
- History1
