- Saint Helens, Mount (Wash.)6
- Saint Helens, Mount (Wash.) -- Eruption, 19803
- Volcanic ash, tuff, etc. -- Environmental aspects -- Washington (State)2
- Baker, Mount (Wash.)1
- Basalt -- Inclusions -- Cascade Range1
- Basalt -- Inclusions -- Oregon1
- Broilers (Poultry)1
- Conifers1
- Erosion -- Washington (State) -- Saint Helens, Mount, Region1
- Forest reproduction -- Washington (State) -- Saint Helens, Mount, Region1
- Hydrology -- Washington (State) -- Saint Helens, Mount, Region1
- Idaho -- Antiquities1
- Legionella pneumophila1
- Legionnaires' disease1
- Magmatism -- Washington (State) -- Saint Helens, Mount1
- Mineral industries -- Environmental aspects1
- Plant ecology -- Washington (State)1
- Plant succession -- Washington (State)1
- Reforestation -- Washington (State) -- Saint Helens, Mount, Region1
- Saint Helens, Mount (Wash.) -- Eruption, 1980 -- Physiological effect1