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Subject
- Roads4
- Administrative and political divisions2
- Geology2
- Industries2
- Soils2
- Botanical gardens1
- Classification1
- Climate1
- Climatology1
- Coast changes1
- Diplomatic and consular service, American1
- Earthquakes1
- Ecological regions1
- Environmental sciences1
- Glaciers1
- Groundwater1
- Lava flows1
- Mines and mineral resources1
- Phytogeography1
- Research1
