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- Lectures and lecturing 81
- Conservation of natural resources 19
- Football 17
- College students 10
- Universities and colleges--Periodicals 10
- Izaak Walton League of America 9
- Rivers--Oregon 8
- Wildlife refuges 8
- Academy of Political Science (U.S.) 7
- Proceedings of the Academy of Political Science 7
- Birds--Conservation 6
- Oregon Wildlife Federation 5
- Dams 4
- Game and game-birds 4
- Water--Pollution 4
- Hunting 3
- Oregon State Planning Board 3
- Wildlife management 3
- Agriculture 2
- American Game Association 2