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- Wildlife refuges 34
- Birds--Conservation 13
- Hunting 8
- Agriculture 7
- Lakes--Oregon 5
- Lakes--California 4
- Waterfowl 4
- Fishing 3
- Rivers--Oregon 3
- United States. Bureau of Biological Survey 3
- Wildlife conservation 3
- Bears 2
- Burning of land 2
- Dams 2
- Ducks 2
- Forests and forestry 2
- Irrigation 2
- Land use--Planning 2
- National parks and reserves 2
- Oregon State Planning Board 2