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Subject
- Roads[remove]30
- Cities and towns8
- Highway planning8
- Canals3
- Design and construction2
- Indian reservations2
- Counties1
- Description and travel1
- Discoveries in geography1
- Discovery and exploration1
- Distances1
- Distances, etc1
- Express highways1
- Indians of North America1
- Military bases1
- Mines and mineral resources1
- Monuments1
- National parks and reserves1
- Outdoor recreation1
- Pacific wagon roads1
