1. Free Library of Philadelphia, Lewis E M 72:12 DS ID: DS5680 Title: Gradual Place: Perugia and Italy Date: 1300-1350
2. Free Library of Philadelphia, Lewis E M 72:13-14 DS ID: DS5681 Title: Antiphonary Place: Perugia and Italy Date: 1300-1350
3. Free Library of Philadelphia, Lewis E M 72:15-16 DS ID: DS5682 Title: Gradual Place: Perugia and Italy Date: 1300-1350