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Topic
Lectures and lecturing
6
Rivers--Oregon
2
Sewage disposal plants
2
Water--Pollution
2
"Lang Syne" Society of Portland, Oregon
1
Birds--Conservation
1
Ducks
1
Hunting
1
Mazamas (Portland, Or.)
1
Migratory birds
1
Oregon Wildlife Federation
1
Waterfowl
1
Wildlife refuges
1
