Photograph of the Nebula in Orion, taken by Professor Henry Draper, M.D., March 11th, 1881. Exposure 104 minutes. (titre original)

inconnu, “Photograph of the Nebula in Orion, taken by Professor Henry Draper, M.D., March 11th, 1881. Exposure 104 minutes. (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 3 mai 2024, https://bibnum.obspm.fr/ark:/11287/1tgXM.