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Physiographic Diagrams of Mount St. Helens, Washington, Showing Changes in its Summit Crater, Summer 1981.
6353.057
pilot2
Physiographic Diagrams of Mount St. Helens, Washington, Showing Changes in its Summit Crater, Summer 1981 - Continued. July 1, 1981.
1988
Leighley, Terry
U.S. Geological Survey
52 × 41 cm