PL 54 · cols. 117–138

Ballerini, Praefatio in Sermones S. Leonis Magni (de manuscriptis fontibus)

The Ballerini brothers: the preface to Leo's sermons, on the lectionaries and collections from which the sermons come and by which they are corrected, with their lists of the sermons' opening words, in Latin, with Migne's note.