Sleeve of plate H-335-H containing discovery of Cepheids in the Andromeda Galaxy. Printed on this sleeve are "Plate No." filled in ms. with "H 335 H"; "Date" filled in ms. with "Oct. 5, 1923"; "Subject", and "Remarks". Written at the bottom of this front side of the sleeve is "On this plate 1st Cep. found". Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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