Stanley Sadie remarks that the work of the NMA was "hampered by the removal in World War II and the unavailability until 1980 of most of the largest single collection of Mozart autographs, that of the Berlin State Library, Berlin."
Stanley Sadie highlights that the National Music Archive (NMA) encountered difficulties because of the loss of a substantial collection of Mozart autographs during World War II, which was housed at the Berlin State Library, Berlin.