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Subject
- Railroads96
- History67
- Roads47
- Geology38
- Boundaries27
- Indians of North America27
- Geomagnetism21
- Maps21
- Surveys20
- Metropolitan areas19
- Census districts18
- Population17
- Geology, Stratigraphic15
- Geology, Structural15
- Indian reservations15
- Election districts13
- Forests and forestry13
- Administrative and political divisions12
- Magnetic declination12
- Military bases12
