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

inconnu, “Harvard Mining School. Plat of the Observatory Grounds of Harvard University, surveyed October 1869 (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 20 novembre 2024, https://bibnum.obspm.fr/ark:/11287/3FPhB.