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Subject
- Geology84
- Administrative and political divisions19
- Census districts3
- Geology, Structural3
- Roads3
- Gas fields2
- Geology, Stratigraphic2
- Geomagnetism2
- Glacial epoch2
- Glacial landforms2
- Mines and mineral resources2
- Oil fields2
- Petroleum2
- Physical geography2
- Surveys2
- Aerial photogrammetry1
- Aerial photography1
- Cartes1
- Climatology1
- Copper ores1
