First Edition. 8vo., paged -276; VG-; brown cover with black print, pencil notations at top edge, mild creasing, upper right corner slightly bumped; back cover has blue library stamp at top edge; clean interior, right edge of pages slightly creased; "Reprinted from Journal of the Washington Academy of Sciences, Vol. 16, No. 10, May, 1926"; "Papers from the Geophysical Laboratory, Carnegie Institution of Washington, No. 604."
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