Collections are groups of documents or resources related to a subject or to a single author.
A collection of documents usually contains unpublished material owned by APUG. Resources instead can collect other kind of material, such us images, maps and bibliographies.
The Gregorian Centre for Interreligious Studies in cooperation with the Historical Archives of the Pontifical Gregorian University started digitizing the unpublished writings of Baldassarre Loyola Mandes S.J. (1631-1667). Son of the king of Fez (Morocco), Muley Mohammed el-Attaz a Muslim prince converted to Christianity, after he was capture by the Knights of Malta, while he was travelling to Mecca for pilgrimage. He took the name of Baldassarre Loyola Mandes to honor both the day of his baptism (July 31, 1656, feast of Saint Ignatius of Loyola) and the knight who made him prisoner and who was his godfather (Balthasar Mandols). A few years later, the 11th General Congregation of the Society of Jesus, gathered in Rome, authorized his admission to the novitiate at Saint Andrew at the Quirinal (1661). Desiring to leave on a mission to the empire of the Great Moghul, he died in Madrid at the beginning of his journey. His life, well known in the first Society, was staged by Pedro Calderón de la Barca and it was played in all the Jesuit colleges. Baldassarre was the only former Muslim admitted to the Society of Jesus until the abolition in 1946 of the decree of the 5th General Congregation (1594), which forbade the admission of net-converts.
Angelo Secchi (1818-1878) was a jesuit astronomer and scientist, one of the fathers of the modern Astrophysics. APUG preserves a large amount of his works, both handwritten and printed - with a lot of manuscript addition - and his extensive correspondence with the most important scientists of his time. With about 8,000 letters and more than 1,500 people involved, this correspondence is a treasure for the History of Science studies.