- Oregon State Agricultural College5
- Oregon Agricultural College -- Alumni and alumnae -- Directories2
- Electric power-plants -- United States1
- Festivals -- Oregon -- Eugene1
- Forest management -- Environmental aspects -- Northwest, Pacific1
- Forests and forestry -- Northwest, Pacific1
- Frontier and pioneer life -- Oregon1
- Habitat (Ecology)1
- Land use -- Oregon -- Planning1
- Land use -- Oregon -- Yamhill County -- Planning1
- Land use, Rural -- Oregon -- Planning1
- Land use, Rural -- Oregon -- Yamhill County -- Planning1
- Names, Geographical -- Washington (State)1
- Nez Percé Indians -- Wars, 18771
- Northern spotted owl -- Northwest, Pacific1
- Northwest, Pacific -- Social life and customs1
- Old growth forests -- Government policy -- Northwest, Pacific1
- Old growth forests -- Northwest, Pacific1
- Overland journeys to the Pacific1
- Pacific Coast Indians, Wars with, 1847-18651