Specola Astronomica Vaticana III, Colori Stellari Osservati a Roma Negil Anni 1844-1846, by Benedetto Sestini and J.G. Hagan,, 1911

Specola Astronomica Vaticana III, Colori Stellari Osservati a Roma Negil Anni 1844-1846, by Benedetto Sestini and J.G. Hagan,, 1911, box-folder: 31. Georgetown Observatory Collection, GRB-000010. Georgetown University Rare Books , Booth Family Center for Special Collections. https://findingaids.library.georgetown.edu/repositories/14/archival_objects/1163400 Accessed April 19, 2024.