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- Dams 71
- Rivers--Idaho 63
- Rivers--Oregon 54
- Universities and colleges--Faculty 40
- Oregon State University. Extension Service 33
- Rivers--Washington (State) 31
- Portraits 29
- Waterfalls 22
- Rivers 20
- Fishways 15
- Lakes 15
- Portraits, Group 13
- College buildings 12
- Baseball players 11
- Mountains 11
- Valleys 10
- Baseball 9
- Hardware, Computer 9
- Greenhouses 8
- Festivals 6