Babcock, Harold D., et al

Summary of Mount Wilson magnetic observations of sunspots for May and June, 1944

[San Francisco]: Astronomical Society of the Pacific, 1944. 8vo, pp. [2], 15, [1]; original blue printed wrappers; stamp of the Brooklyn Book Shop on the inner back wrapper; very good. Five short articles; reprinted from the Publications of the Astronomical Society of the Pacific, Volume 56, No. 331. Item #56970

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