"Volcanic ash, tuff, etc. Washington (State) Composition." . . "Vulkan USA." . . "Eruption of Mount Saint Helens (Washington : 1980)" . . . "Mount Saint Helens." . . . . "Volcanic ash, tuff, etc. Composition." . . "Geological Survey (U.S.)," . . "Chemie." . . "Geschichte (1980)" . . "Eruption." . . "Saint Helens, Monte (Estados Unidos)" . . "1980" . . "Saint Helens, Mount (Wash.)" . . "Vulcani Mount St. Helens (Statele Unite ale Americii)" . . "Washington (State)" . . "Geological Survey (États-Unis)" . . "Rocas piroclásticas Estados Unidos Estados Unidos Washington (Estado)" . . "Vulkanasche." . . . "Chemistry of Ash and Leachates from the May 18, 1980 Eruption of Mount St. Helens, Washington" . . . . . . . . . . . . . . . . . . . . . . . "Chemistry of ash and leachates from the May 18, 1980 eruption of Mount St. Helens, Washington" . . . . . . . . . . . "Publications officielles" . . . . . "Chemistry of ash and leachates from the May 18, 1980 eruption of Mount St-Helens, Washington" . . . . .