1. Free Library of Philadelphia, Lewis E M 48:15 DS ID: DS5450 Title: Gradual Place: Perugia and Italy Date: 1340-1360
2. Free Library of Philadelphia, Lewis E M 72:12 DS ID: DS5680 Title: Gradual 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