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Topic
- Izaak Walton League of America 20
- Rivers--Oregon 11
- Water--Pollution 7
- Lectures and lecturing 5
- Dams 4
- Oregon Cavemen Inc. 3
- Portland Chamber of Commerce (Or.) 3
- Sewage disposal plants 3
- Algae 1
- American Nature Association 1
- Birds--Housing 1
- Fishes--Conservation 1
- Fishing 1
- Foxes 1
- Geese 1
- Hunting 1
- Motion pictures 1
- National Wildlife Federation 1
- National parks and reserves 1
- Nature films 1
