Finlay’s Comet. Photograph II, 1882 Oct. 20d 15h 30m. Exposure 60m, equivalent focus of lens about 11 inches

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David Gill , “Finlay’s Comet. Photograph II, 1882 Oct. 20d 15h 30m. Exposure 60m, equivalent focus of lens about 11 inches,” Bibliothèque numérique - Observatoire de Paris, consulté le 20 novembre 2019, https://bibnum.obspm.fr/ark:/11287/JXZGR.