First Edition. 8vo., paged -564, illustrated, graphs, tables; VG; grey cover with black print, ink notation above title; clean interior; "From American Journal of Science, Vol. 248, August, 1950, Pp. 540-564"; "Paper No. 113 published under the auspices of the Committee on Experimental Geology and Geophysics and the Division of Geological Sciences at Harvard University"
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