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Mathews, H. E., “Lick Observatory, Cal. : the Star Spectroscope made by J. A. Brashear, Allegheny, Pa. from designs by James E. Keeler (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 24 novembre 2024, https://bibnum.obspm.fr/ark:/11287/3sC2L.