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Topic
- Rivers--Oregon 17
- Dams 12
- Flood control 8
- Fishes--Conservation 7
- Lectures and lecturing 7
- Water--Pollution 7
- Oregon Wildlife Federation 6
- Salmon 6
- Poaching 5
- Swans 5
- Izaak Walton League of America 4
- Nature photography 3
- Oregon. State Game Commission 3
- Sewage disposal plants 3
- Bears 2
- Irrigation 2
- National parks and reserves 2
- Oregon Audubon Society 2
- Pacific College (Newberg, Or.) 2
- Waterfowl 2
