Abbot, C.G. ; Bond, Gladys T., - Periodicity in Solar Variation: Smithsonian Miscellaneous Collections, Volume 87, Number 9.

Washington, D.C., Smithsonian Institution, 1932. Trade Paperback., G in Wraps. Thread-Bound Booklet. X-Library with Usual Flaws. Pages: 14. Light Edgewear. Small Tears at Fore-Edge. A Few Uncut Page Edges.

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