Subject
- African trypanosomiasis -- Africa -- Epidemiology1
- African trypanosomiasis -- Environmental aspects -- Africa -- Mathematical models1
- Arthropoda -- Ecology -- California1
- Barley yellow dwarf viruses -- Oregon -- H.J. Andrews Experimental Forest -- Mathematical modeling1
- Endemic plants -- Northwest, Pacific1
- Food chains (Ecology) -- California1
- Grasses -- Diseases and pests -- Oregon1
- Grasses -- Ecology -- Northwest, Pacific1
- Grasses -- Soils -- Northwest, Pacific1
- Grassland ecology -- California1
- Grazing -- Environmental aspects -- California1
- Herbivores -- Ecology -- California1
- Host-parasite relationships -- Environmental aspects -- Mathematical models1
- Invasive plants -- Ecology -- California1
- Multitrophic interactions (Ecology) -- California1
- Plant-soil relationships -- Northwest, Pacific1
- Prairie conservation -- Northwest, Pacific1
- Rhopalosiphum -- Fertility -- Oregon1
- Rhopalosiphum -- Host plants -- Oregon1
- Soil chemistry -- Northwest, Pacific1