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Keywords: M13-ESHolden 1880 91-DiagramPASP.jpg en This is a diagram of M13 produced after photographs taken by Holden and Campbel in 1890 and 1891 at the Lick Observatory Eduard S Holden 1891 Characteristic Forms Within the Cluster in Hercules Publication of the Astronomic Society of the Pacific 3 19 Eduard S Holden 1891-11-28 PD-old-auto-1923 1914 Messier 13 Eduard S Holden Lick Observatory Publications of the Astronomical Society of the Pacific PD-old-70-1923 |