Williams, C. (1988). Mount St. Helens National Volcanic Monument: A pocket guide for hikers, viewers, and skiers. Mountaineers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Chuck. Mount St. Helens National Volcanic Monument: A Pocket Guide for Hikers, Viewers, and Skiers. Seattle: Mountaineers, 1988.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWilliams, Chuck. Mount St. Helens National Volcanic Monument: A Pocket Guide for Hikers, Viewers, and Skiers. Mountaineers, 1988.
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