Lick Observatory, Cal. : the Star Spectroscope made by J. A. Brashear, Allegheny, Pa. from designs by James E. Keeler (titre original)

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 8 janvier 2025, https://bibnum.obspm.fr/ark:/11287/3sC2L.