Deposits of pre-1980 pyroclastic flows and lahars from Mount St. Helens volcano, Washington /
Crandell, Dwight R.(Dwight Raymond),1923-2009.
Washington : Government Printing Office,
1987.
Spine title: Pre-1980 pyroclastic flows and lahars from Mount St. Helens, Washington.
Folded map inserted in pocket: showing localities referred to in the text. Scale 1:100,000.
Volcanic ash, tuff, etc.
Lahars
Geology