(We do have this book in the Leyburn Library:
 
 AUTHOR       Brusendorff, Aage, 1887-
 TITLE        The Chaucer tradition, by Aage Brusendorff.
 PUBLISHER    London: H. Milford, Oxford university press, Copenhagen: V. Pio,
                c1925.
 DESCRIPT     510 p. front., plates, facsims. 24 cm.
 NOTE         "The first sketch of this book was written in Danish ... and
                accepted as a doctor's thesis by the ... University of
                Copenhagen in March, 1921 ....  My purpose has been to examine
                the way in which the knowledge of Chaucer's personality and
                writings was handed down by the first two generations of the XV
                century."--Pref.
 BIBLIOG.     "Works written by or ascribed to Chaucer": p. [497]-502.
 SUBJECT      Chaucer, Geoffrey, d. 1400.
              Chaucer, Geoffrey, d. 1400 --Biography --Sources.
 Leyburn Library        PR1911 .B7