National Geographic : 1954 Jun
749 National Geographic Photographer J. Baylor Roberts August Snows Patch Lassen Peak, Last Volcano in the United States To Blow Its Top Forty years ago a puff of steam signaled the boiling of Lassen's volcanic pot. During the following months 150 explosions hurled steam and stone thousands of feet. Hot rock sprayed from the crater, melting snow and sending avalanches of mud into near-by valleys. Lassen's explosive spree ended in 1917, but the volcano still lets off steam. Stiff lava, squeezed like toothpaste from a tube, built this steep dome during an earlier eruption.