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Subject
- Land use, Rural35
- Mines and mineral resources11
- Geology9
- Motor vehicles7
- Outdoor recreation7
- Recreational use7
- Magnetic anomalies6
- Real property6
- Roads6
- All terrain vehicles5
- Geomagnetism4
- Boundaries2
- Express highways2
- Forest reserves2
- Geophysics2
- Indians of North America2
- Irrigation2
- Navigation2
- Observations2
- Public lands2
