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- Architecture, American 724
- Architecture--United States 724
- Government publications 105
- Photography 56
- Northwest, Pacific 48
- United States--Appropriations and expenditures 43
- River engineering 42
- West (U.S.) 37
- Tourism 28
- Scenic byways 23
- Rivers 21
- Highway engineering 19
- Mountains 12
- Canals--Design and construction--Costs 11
- Explorers 10
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- Locks (Hydraulic engineering) 8
- Maps 8
- Waterfalls 8
- Bodies of water 7