Subject
- Agriculture -- Oregon198
- Fishing -- Oregon196
- Hunting -- Oregon195
- Forests and forestry -- Oregon186
- Fishery management181
- U.S. International Biological Program. Coniferous Forest Biome157
- Potatoes -- Oregon -- Klamath County156
- Herbicides144
- Apples -- Diseases and pests136
- Agriculture130
- Pears -- Diseases and pests125
- Fisheries124
- Vegetable gardening -- Oregon114
- Fishery policy113
- Lane County (Or.) -- History104
- Codling moth -- Control103
- Heat -- Transmission91
- Insecticides -- Research91
- Wood -- Moisture91
- Forests and forestry -- Research -- Oregon90