Johann van Beethoven, Brief an Ferdinand Ries in Godesberg https://www.beethoven.de/de/media/view/6027496529068032/Nikolaus+Johann+van+Beethoven%2C+Brief+an+Ferdinand+Ries+in+Godesberg%2C+Wien%2C+6.+Mai+1825%2C+Autograph?fromArchive=5649946187399168
Johann van Beethoven, Brief an Ferdinand Ries in Godesberg
Johann van Beethoven, Brief an Ferdinand Ries in Godesberg