Sky and Telescope
Vintage SKY and TELESCOPE Magazine May 1968
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Vintage Sky and Telescope Magazine, May 1968,61 pages.
Articles include : The Discovery of Jupiter’s Red Spot, Apropos of Algol’s Changing Period, Non-gravitational Forces and Comet Nuclei, News of the Soviet Six-Meter Reflecting Telescope, Notes on Modern Telescope Mountings, Explorer 37 Studies the Sun. as well as many other articles and ads.