Incipit laus Sancti Bernardi Abatis; Laus de Virgine Maria: Ave mater misericordie may be the oldest book in the Archives and Special Collections.
I found this description of the book on a sheet of letterhead paper tucked into the book:
“Manuscript on paper, written in a fine formal book hand. 28 lines. 12 leaves (the last 4 blank). Initials in red. Rubricated. 4to. Boards. …Italy, middle XVth cent.
A beautifully written manuscript of the Laus de Virgine Maria, one of a number of poems attributed to St. Bernard, is on leaves 1-8r. The balance of 8r and 8v, contains the poem Ave Mondi (sic) spes Maria, attributed to Pope Innocent III.”
The Archives and Special Collections has a number of books and manuscripts written in Latin. These are great for those who want to practice reading or translating Latin. Also, many of these will be of interest to researchers of the history of religions or book-making.