Physiographic Diagrams of Mount St. Helens, Washington, Showing Summit Crater, July 1, 1982.

Physiographic Diagrams of Mount St. Helens, Washington, Showing Changes in its Summit Crater, Summer 1982. July 1, 1982.

Alpha, Tau Rho

1983

1988

U.S. Geological Survey

• 发现
• 比较
• 3D
• 文件