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Topic
Dams
8
Rivers--Oregon
8
Flood control
6
Fishes--Conservation
2
Irrigation
2
Salmon
2
Fishers
1
Fishways
1
Inland water transportation
1
Oregon Audubon Society
1
Oregon Wildlife Federation
1
Oregon. State Game Commission
1
Pacific College (Newberg, Or.)
1
Waterfalls
1