1. Free Library of Philadelphia, Lewis E M 66:9 DS ID: DS5590 Title: Gradual Place: Flanders Date: 1300-1325
2. Free Library of Philadelphia, Lewis E M 66:12 DS ID: DS5593 Title: Gradual Place: Flanders Date: 1485-1499
3. Free Library of Philadelphia, Lewis E M 66:13-14 DS ID: DS5594 Title: Gradual Place: Flanders Date: 1490-1510