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Subject
- Real property33
- Maps29
- Administrative and political divisions24
- Railroads23
- Boundaries18
- World War, 1914-191815
- History13
- Coasts10
- Discovery and exploration10
- Land grants9
- Travel8
- Geology6
- Indians of North America6
- Ethnology5
- Gold mines and mining5
- Harbors5
- Historical geography5
- Mines and mineral resources5
- Roads5
- Aeronautical charts4
