1. Free Library of Philadelphia, Lewis E M 19:1 DS ID: DS4972 Title: Choir book Place: Bologna and Italy Date: 1300-1399
2. Free Library of Philadelphia, Lewis E M 45:1 DS ID: DS5382 Title: Choir book Place: Bologna and Italy Date: 1300-1350
3. Free Library of Philadelphia, Lewis E M 45:4 DS ID: DS5385 Title: Choir book Place: Bologna and Italy Date: 1300-1399