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Subject
- Geology38
- Mines and mineral resources15
- Coal12
- Quarries and quarrying12
- Maps4
- Nautical charts3
- Banks (Oceanography)2
- Coasts2
- Faults (Geology)2
- Geology, Structural2
- Harbors2
- Coal mines and mining1
- Defenses1
- Fortifications1
- Geology, Stratigraphic1
- Gold mines and mining1
- Landowners1
- Potash deposits1
- Roads1
- Salt deposits1
