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Topic
Dams
7
Rivers--Oregon
7
Flood control
5
Lectures and lecturing
4
Fishes--Conservation
3
Salmon
3
Birds--Conservation
1
Irrigation
1
Izaak Walton League of America
1
Oregon Audubon Society
1
Pacific College (Newberg, Or.)
1
Poaching
1
Swans
1
Wildlife refuges
1