Title: Sediment deposition in the Columbia and Lower Cowlitz Rivers, Washington-Oregon, caused by the May 18, 1980, eruption of Mount St. Helens
Subjects: Eruption, 1980, Sedimentation and deposition, Sediments (Geology)
Places: Columbia River, Cowlitz River, Mount (Wash.) Saint Helens, Saint Helens, Mount (Wash.), Washington (State)