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Subject
- Geology23
- Administrative and political divisions13
- Cities and towns9
- Mines and mineral resources7
- Roads5
- Topographic maps4
- Forest reserves2
- Geography2
- Geology, Stratigraphic2
- Historical geography2
- Maps2
- Aeronautical charts1
- Coal1
- Coal mines and mining1
- Cold War1
- Drainage1
- Experimental watershed areas1
- Foreign relations1
- Forest surveys1
- Forests and forestry1
