Subject
- Agricultural pests -- Control -- Congresses46
- Pears -- Diseases and pests26
- Forests and forestry -- Northwest, Pacific23
- Forests and forestry -- Oregon20
- Oregon State University. College of Forestry20
- United States. Forest Service. Pacific Northwest Region17
- United States. Forest Service. Pacific Northwest Region. Thirty Year Club17
- Fishery management -- Oregon -- Statistics14
- Fishing -- Oregon -- Statistics14
- Pear psylla -- Control14
- Fish-culture -- Oregon -- Statistics13
- Lane County (Or.) -- History10
- Forest ecology -- West (U.S.)9
- Forests and forestry -- Research -- Oregon8
- Lumber -- Drying7
- U.S. International Biological Program. Coniferous Forest Biome7
- Automobiles -- Societies, etc6
- Dissertations, Academic -- United States -- Bibliography -- Catalogs6
- Fisheries -- Oregon6
- Forest products -- Research -- Oregon6