Helena Josepha Maria Graff, von Pfullendorf

Source(s):
Aßfalg, Winfried. From Riedlingen to Vienna, along the Danube. Conrad Graf (1782-1851). "Kaiserl. can Hof-Fortepianomacher Wien". In: Society for Home Care Biberach e. V. (Ed.): BC - Local history sheets for the district of Biberach. 18th year. Issue 1/1995, pp. 3-30, ZDB-ID 136055-3. Pages 3-4.