Utrecht, Catharijneconvent, BMH h. 21

W.C.M. Wüstefeld, Middeleeuwse Boeken von het Catharijneconvent. Zwolle, Utrecht, 1993.no 43:Graduale van of voor pater Heer Gerrit en frater Ludz te Hoorn Graduale Traiectense Noord-Holland, vor/door pater Heer Gerrit en/of frater Ludz ca. 1500-1520 232 f. 384x280 (263x185) 1 kol. littera textualis, Note notational subtlety in sequentiary---exemplified in Gaudeat Hyspania--- two forms of podatus. one with longer first note (transcribed as double) two forms of climacus. one with double last note.