18, 1980, 23, AFTERMATH, AND, BARK, BAYONET, CASCADE, CATASTROPHE, DAMAGE, DEVASTATION, DIRECTION, DISASTER, ERUPTION, GEOLOGY, HELENS, LAHAR, LANDSCAPE, MAY, MOUNT, MT, NATURAL, OCTOBER, OF, POST-ERUPTION, SAINT, SCIENCE, SHOW, SOURCE, STATE, STRIPPED, THE, TRAVELED, TREE, TREES, USGS, VEGETATION, VOLCANIC, VOLCANO, VOLCANOLOGY, WASHINGTON,