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Subject
- Roads21
- History17
- Railroads14
- Indians of North America11
- Geomagnetism9
- National parks and reserves8
- Administrative and political divisions7
- Highway planning7
- Maps7
- Cities and towns6
- Distances6
- Geology6
- Boundaries5
- Canals5
- Surveys5
- Census districts4
- Distances, etc4
- Government publications4
- Indian reservations4
- Land use, Rural4
