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Subject
- Railroads[remove]925
- Administrative and political divisions66
- Roads51
- Steamboat lines20
- Railroad land grants19
- Indian reservations17
- Counties15
- Description and travel15
- Transportation15
- Canals14
- Maps14
- Military bases14
- Land grants9
- Mines and mineral resources9
- Real property8
- Pacific railroads7
- Post roads7
- Postal service7
- Telegraph lines7
- Public lands6
