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- Rivers--Oregon 46
- Dams 25
- Exhibitions 24
- Lewis and Clark Exposition (1905 : Portland, Or.) 24
- Lichens 24
- Civilian Conservation Corps (U.S.) 17
- Rivers--Washington (State) 16
- Buildings 15
- Waterfalls 14
- Multnomah Falls (Or.) 12
- Bridges 7
- Fishways 7
- Gardens 7
- Oregon State University. Extension Service 7
- Parks 6
- Agriculture 5
- Forests and forestry 5
- Lakes 4
- 4-H clubs 3
- Boats 3