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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New York, N.Y. 1919. First Edition. 8vo, paged -2124, graphs, tables; VG-; green cover with black print, pencil notations at top edge, mild bumping to outer corners, mild creasing at spine, stray pencil mark near title, slight spotting, back cover has blue library stamp at top edge, slight smudging; interior clean but for slight spotting; "Reprinted from Bulletin No. 153, September, 1919, American Institute of Mining and Metallurgical Engineers (Chicago Meeting, September, 1919)."