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- Roads--Design and construction 33
- Civilian Conservation Corps (U.S.) 11
- Meetings 6
- Northwest, Pacific 6
- Portraits, Group 6
- Scenic byways 5
- Forests and forestry 4
- Photography 4
- Roads 3
- Bridges 2
- Tractors 2
- Waterfalls 2
- American wit and humor, Pictorial 1
- Coasts--Oregon 1
- Columbia River Highway (Or.) 1
- Formations (Geology) 1
- Izaak Walton League of America 1
- Jetties 1
- Oregon Cavemen Inc. 1
- Oregon--Politics and government 1