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Subject
- Roads22
- History18
- Railroads14
- Indians of North America11
- Geomagnetism9
- Highway planning8
- Maps8
- National parks and reserves8
- Administrative and political divisions7
- Cities and towns7
- Geology7
- Distances6
- Boundaries5
- Canals5
- Surveys5
- Census districts4
- Distances, etc4
- Forests and forestry4
- Government publications4
- Indian reservations4
