Subject
- Agricultural pests -- Control -- Congresses250
- 4-H clubs101
- Apples -- Diseases and pests66
- Pears -- Diseases and pests62
- Fishery management -- Congresses61
- Seafood industry -- Congresses61
- Forest management -- Congresses37
- Hill farming -- Congresses37
- Hillside planting -- Congresses37
- Agricultural experiment stations -- Research -- Oregon -- Jackson County35
- Agriculture -- Oregon -- Jackson County -- Field experiments35
- Entomology35
- Codling moth -- Control33
- Forests and forestry -- Oregon28
- Oregon State University. College of Forestry28
- Herbicides26
- Pear psylla -- Control26
- Weeds -- Control26
- Agricultural experiment stations -- Research -- Oregon -- Malheur County15
- Agriculture -- Oregon -- Malheur County -- Field experiments15