Nebulae in Orion, Exposure 1h 7m, enlarged 5 times, 30th November 1882 (titre original)

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Roberts, Isaac (1829-1904), “Nebulae in Orion, Exposure 1h 7m, enlarged 5 times, 30th November 1882 (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 3 mai 2024, https://bibnum.obspm.fr/ark:/11287/Xfhvc.