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Subject
- Lead mines and mining1
- Manpower1
- Maps1
- Mining districts1
- Petroleum1
- Petroleum mining1
- Petrology1
- Physical geography1
- Population1
- Recreational use1
- Remote-sensing maps1
- Rivers1
- Rocks, Carbonate1
- Surveys1
- Trading posts1
- Water quality1
- Water resources development1
- Water resources management1
- World War, 1939-19451
- Zinc mines and mining1
