Astronomical League Double Star Club Certificate.
Related Info: Double Star Club: Introduction Observing list Log Sheet Awardees Arp Peculiar Galaxy Club. Asteroid Observing Club; Binocular Messier Club; Caldwell Club; Deep Sky Binocular Club; Double Star Club; Earth Orbiting Satellite Club; Herschel 400 Club; Herschel II Club; Lunar Club; The Master Observer Club; Messier Club; Meteor Club; Planetary Observers Club; Southern Skies Binocular ...
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