Harvard Mining School. Plat of the Observatory Grounds of Harvard University, surveyed October 1869 (titre original)

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inconnu, “Harvard Mining School. Plat of the Observatory Grounds of Harvard University, surveyed October 1869 (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 7 mai 2024, https://bibnum.obspm.fr/ark:/11287/3FPhB.