Mount St. Helens National Volcanic Monument : a pocket guide for hikers, viewers, and skiers / Chuck Williams. Mount Saint Helens National Volcanic Monument. Williams, Chuck. 1943- 910.202 WIL Includes index. Seattle : Mountaineers, c1988. c1988. 1988 Text 112 p. : eng Mount Saint Helens National Volcanic Monument (Wash.) Guidebooks.