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- Geology10
- World War, 1939-19457
- Campaigns5
- Mines and mineral resources5
- Military campaigns4
- History3
- World War, 1914-19183
- Historical geography2
- Maps2
- Ore deposits2
- Railroads2
- Aeronautics, Commercial1
- Bearings industry1
- Boundaries1
- Cartes1
- Coal mines and mining1
- Coasts1
- Ethnology1
- Farm produce1
- Fishery processing plants1
