Committee on Geophysical Research and the Division of Geological Sciences at Harvard University. First Edition. 8vo, paged 279-288, tables; VG; red cover with black print, small pencil notation in upper right corner of front cover, slight bump to outer corners; interior clean; "Paper No. 42"; "Reprinted from Journal of Applied Physics, Vol. 9, No. 4, April, 1938."
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