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Subject
- Land use57
- Public lands41
- Geology37
- Wilderness areas21
- Planning20
- Transportation15
- Federal aid to transportation13
- Maps10
- Roads10
- Administrative and political divisions5
- Recreation areas4
- Outdoor recreation3
- Water-supply3
- Forest reserves2
- Land tenure2
- National parks and reserves2
- Real property2
- Recreational use2
- Water2
- All terrain vehicles1
