||Piano Quartet No.3
||Grand quatuor pour le piano-forte, violon, viola, et violoncelle
composed in London in 1820 according to a contemporary Catalogue Thematique of Ries' music available online (which however was based on Ries' not terribly reliable late-in-life memory, for the most part.)
Publication by Peters in 1824 is mentioned in the December 1824 Allgemeine Musikalische Zeitung.
Publication information confirmed in Cecil Hill, Ferdinand Ries: A Thematic Catalogue.