PL 54 · cols. 9–32
Pietro and Girolamo Ballerini, Epistola nuncupatoria ad Benedictum XIV et Praefatio generalis in hanc editionem
The Ballerini brothers (1753): the dedication of their edition of Leo the Great to Benedict XIV and their general preface to it (sections I-XXIV), in Latin, with their own notes.
Migne Reading Room