Eruptions from Mount Adams began about 520 ka, although scattered basaltic eruptions from the surrounding volcanic field began by about 940 ka.
Global Volcanism Program
Mount St. Helens Before 1980 Eruption: The Untold Story of Mount St. Helens
Mount St. Helens In Eruption On May 18 1980. In The Background Is Another Cascade Volcano Mt. Adams. History - Item # VAREVCHISL030EC085 - Posterazzi
Three Generations, One Big Volcano: Pushing Limits On Mount St. Helens - The Big Outside
2190 eruption of Mt Adams, Hypothetical Volcanoes Wiki
Mount Adams Planting for Wildfire Recovery and Watershed Health - National Forest Foundation
Mount Adams - Hiking in Portland, Oregon and Washington
Fire Adapted Mt. Adams – Mt. Adams Resource Stewards
WA100: A Washington Geotourism Website
Volcano Profile: Mount Adams – WASHINGTON STATE GEOLOGY NEWS