Williams, Howell. (1941). Calderas and their Origin. Berkley: University of California Press, 1st edition, 107 pp. Paperback,
Williams, Howell. (1941). Calderas and their Origin. Berkley: University of California Press, 1st edition, 107 pp. Paperback, Off print from Bull. Dept of Geological Sciences, v.25, no.6, pp. 239-346. Cover worn. Author message on cover, owner signature on title page. Text age-toned, clean and unmarked. In good condition.