First Edition. 8 vo, 34 pages, illustrated; VG-; gray cover with black print, ink inscription at top "Compliments of the authors", pencil notations at top edge, vertical center crease throughout, back cover has blue library stamp at top left edge, creasing at spine edge; clean interior but for slight spotting; "From American Journal of Science, Vol. XVIII, July, 1929"; "Papers from the Geophysical Laboratory, Carnegie Institution of Washington, No. 679."
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