Author: Abbot, C.G. ; Bond, Gladys T.,
Title: Periodicity in Solar Variation: Smithsonian Miscellaneous Collections, Volume 87, Number 9.
Description: Washington, D.C., Smithsonian Institution, 1932. Trade Paperback., Vg in Wraps. Thread-Bound Booklet. Pages: 14. A Few Uncut Page Edges.

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