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Keywords: HSLeavittHA60No5Fg5 1908.jpg en Fig 5 H1255 Ten Variable Stars of the Algol Type HS Leavitt 1908 Annals of the Astronomical Observatory of Harvard College Vol 60 No 5 2014-08-15 15 58 40 Ten Variable Stars of the Algol Type Annals of the Astronomical Observatory of Harvard College Vol 60 No 5 1908 Henrietta Swan Leavitt PD-old-70-1923 Uploaded with UploadWizard History of astronomy Harvard College Observatory |