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. More