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inconnu, “Photographic map of the normal solar spectrum made with the concave grating by prof. H.A. Rowland, Johns Hopkins University. 2nd series, 1888. (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 25 décembre 2024, https://bibnum.obspm.fr/ark:/11287/FZv3f.