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Subject
- Trails[remove]430
- Historic sites89
- Hiking48
- National parks and reserves46
- United States. Department of the Interior30
- Roads25
- National Trails System22
- Land titles18
- Public lands15
- Frontier and pioneer life12
- Wild and scenic rivers12
- Overland journeys to the Pacific11
- Recreation areas11
- Backpacking10
- Outdoor recreation10
- Natural history9
- Railroads9
- National monuments8
- United States. National Park Service8
- Government purchasing of real property7