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Subject
- Land use, Rural35
- Geology9
- Forest reserves5
- Volcanism4
- Historical geography2
- Mines and mineral resources2
- Natural areas2
- Wilderness areas2
- Cities and towns1
- Coal mines and mining1
- Earth temperature1
- Geomagnetism1
- Geothermal resources1
- Government publications1
- Groundwater1
- Highway planning1
- Maps1
- Mining districts1
- Paleontology1
- Roads1
