Subject
- Agricultural pests -- Control -- Congresses11
- U.S. International Biological Program. Coniferous Forest Biome5
- Vegetable gardening -- Oregon4
- Forest ecology -- West (U.S.)3
- Beans -- Diseases and pests2
- Conifers -- West (U.S.) -- Ecology2
- Continental shelf -- Oregon -- Pacific Coast2
- Hydrographic surveying -- Oregon -- Pacific Coast2
- Lake ecology -- Washington (State) -- Chester Morse Lake2
- Lake ecology -- Washington (State) -- Findley Lake2
- Lake ecology -- Washington (State) -- Sammamish, Lake2
- Lake ecology -- West (U.S.)2
- Ocean currents -- Oregon -- Pacific Coast2
- Strawberries -- Fertilizers -- Oregon -- Willamette River Valley2
- Stream ecology -- West (U.S.)2
- Waterlogging (Soils) -- Oregon2
- Winter wheat -- Oregon2
- Zooplankton -- Washington (State) -- Chester Morse Lake2
- Zooplankton -- Washington (State) -- Findley Lake2
- Zooplankton -- Washington (State) -- Sammamish, Lake2