- Saint Helens, Mount (Wash.)3
- Baker, Mount (Wash.)1
- Basalt -- Inclusions -- Cascade Range1
- Basalt -- Inclusions -- Oregon1
- Legionella pneumophila1
- Legionnaires' disease1
- Mineral industries -- Environmental aspects1
- Saint Helens, Mount (Wash.) -- Eruption, 19801
- Stream ecology -- Washington (State) -- Saint Helens, Mount, Region1
- Subduction zones -- Cascade Range1
- Subduction zones -- Oregon1
- Toutle River (Wash.)1
- Volcanic ash, tuff, etc. -- Environmental aspects -- Washington (State)1
- Volcanic ash, tuff, etc. -- Washington (State) -- Saint Helens, Mount -- Analysis1
- Volcanism -- Washington (State) -- Baker, Mount1
- Volcanism -- Washington (State) -- Saint Helens, Mount1
- Water -- Pollution -- Washington (State)1
- Watersheds -- Washington (State)1