First Edition. 8vo, paged 207-217, graphs, tables; VG; grey cover with black print, small pencil mark on front cover, slight bump to center of spine edge, mild bumps to outside corners, blue library stamp at bottom edge, slight creasing at bottom right edge; back has slight creasing at top left edge; clean interior; "Reprinted from The Journal of Physical Chemistry, Vol. 43, pp. 207-217, February, 1939"; "Papers from the Geophysical Laboratory, Carnegie Institution of Washington, No. 998."
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