Subject
- Agricultural pests -- Control -- Congresses36
- Pears -- Diseases and pests19
- Agricultural experiment stations -- Research -- Oregon -- Jackson County6
- Agriculture -- Oregon -- Jackson County -- Field experiments6
- Entomology6
- Pear psylla -- Control5
- Two-spotted spider mite -- Control4
- Codling moth -- Control3
- Codling moth2
- Forest ecology -- Oregon -- History1
- Forest fires -- Environmental aspects1
- Forest fires -- Oregon -- History1
- Forest plants -- Washington (State) -- Mount Baker National Forest1
- Forest plants -- Washington (State) -- Snoqualmie National Forest1
- Rain and rainfall -- Oregon -- Tualatin River Watershed1
- Runoff -- Oregon -- Tualatin River Watershed -- Measurement1
- Two-spotted spider mite1
- Water quality management -- Oregon -- Tualatin River Watershed1