Hyde, Jack H. <br/><br/>
Upper Pleistocene pyroclastic-flow deposits and lahars south of Mount St. Helens volcano, Washington / 
by Jack H. Hyde. 
 - Washington:   United States Government Printing Office,   1975.  
 - iv, B20 p. :  ill., maps ;  23 cm. 
 -  1383 .
<br/><br/>Includes bibliographical references (p. B20). 
<br/><br/> A study of a valley-sill assemblage of pyroclastic-flow deposits, lahars, and alluvium of late Pleistocene age south of Mount St. Helens volcano. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Volcanic ash, tuff, etc--Washington (United States)--Saint Helens, Mount<br/>Lahars--Washington (United States)--Saint Helens, Mount<br/>Geology, Stratigraphic--Pleistocene<br/>Geology--Washington (United States)--Saint Helens, Mount
<br/><br/><label>Dewey Class. No.: </label>557.308