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Topic
- Lectures and lecturing 12
- Rivers--Oregon 11
- Water--Pollution 10
- Sewage disposal plants 9
- Izaak Walton League of America 3
- Bears 2
- Birds--Conservation 2
- Dams 2
- Fishes--Conservation 2
- Migratory birds 2
- Oregon Audubon Society 2
- Wildlife refuges 2
- "Lang Syne" Society of Portland, Oregon 1
- Birds--Feeding and feeds 1
- Coatis 1
- Conservation of natural resources 1
- Ducks 1
- Flood control 1
- Gill, John, 1851-1929 1
- Gulls 1