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Sugiyama et Esaki Reiji, “Photographs of the Total Eclipse of the Sun, August 19th, 1887, taken at Yomeiji-yama, Echigo, Japan, by M. Sugiyama, the observer of the Tokio Observatory, under the direction of I. Arai, director of the Observatory ans the Chief of the Expedition (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 6 novembre 2024, https://bibnum.obspm.fr/ark:/11287/2vHvr.