Probably George Vancouver, —
Photo Credit: By anonymous - Public Domain, https://commons.wikimedia.org/w/index.php?curid=6363514

"Mount Fuji of America" — The symmetrical appearance of St. Helens prior to the 1980 eruption earned it the nickname "Mount Fuji of America". The once familiar shape was formed out of the Kalama and Goat Rocks eruptive periods.
Photo Credit: By Created by Clohessy & Strengele - Library of Congress American Memories Website via The Volcanoes of Lewis and Clark: Mount St. Helens, Washington, USGS.gov (accessed 15 Nov 2006), Public Domain, https://commons.wikimedia.org/w/index.php?curid=1373966

Plate tectonics of the Cascade Range —
Photo Credit: By Surachit - Own work. SVG based on the public domain USGS image here: [1]. Image renamed from File:Cascade Range-related plate tectonics.svg, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=6046328

Mount St. Helens — Day before the 1980 eruption, which removed much of the northern face of the mountain, leaving a large crater
Photo Credit: By Harry Glicken, USGS/CVO - USGS photo of Mt. Saint Helens, Public Domain, https://commons.wikimedia.org/w/index.php?curid=634392

Colorful ash in the Valley of Ten Thousand Smokes —
Photo Credit: By Peter Hamel - nps.gov, Public Domain, https://commons.wikimedia.org/w/index.php?curid=4433276

Novarupta geologic cross section — By Hildreth, W., and Fierstein, J. - The Novarupta-Katmai eruption of 1912—largest eruption of the twentiethcentury; centennial perspectives: U.S. Geological Survey Professional Paper 1791
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=71284910

Novarupta — Novarupta's lava dome in July 1987
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=342705

Santa María, 1902 eruption —
Photo Credit: By Julio Yaquier, 1902 - Video de Luis Escobar, Public Domain, https://commons.wikimedia.org/w/index.php?curid=36665381

Steam rises from Santiaguito — The area of the flank destroyed by the 1902 eruption can be clearly seen. Lahar deposits snake down river valleys to the left of the image
Photo Credit: By NASA - http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=7762, Public Domain, https://commons.wikimedia.org/w/index.php?curid=3382934

Santa María, 1902 eruption —
Photo Credit: By Unknown - Weltrundschau zu Reclams Universum 1902, Public Domain, https://commons.wikimedia.org/w/index.php?curid=11772987

Santa Maria Volcano — The volcano as seen from the nearby city of Quetzaltenango
Photo Credit: By Huista at English Wikipedia - Transferred from en.wikipedia to Commons., Public Domain, https://commons.wikimedia.org/w/index.php?curid=3382941