||3 Piano Sonatas
||Cramer, Johann Baptist
||A major; A-flat major; C major
||3 pieces of 3 movements each
||1803 – Leipzig: Breitkopf und Härtel (possibly 1793, see below)
||RISM 454001906 (copy of No.2 (MilC 2.071) in A♭ at Metten in ms made by Emmeram Kreuttner)
Mentioned in AMZ, November 1803 (Intelligenz-blatt section, page 14 and earlier, May 1803, page 72 (along with opp.28, 30, 31 and 4 Divertimenti per il cembalo consistenti a div. Marcie, Andanti e Walzer.). So in any case, not-later-than-1803, and 1803 seems a reasonable guess. Reviewed (along with op.33 also) in June 1803 AMZ, page 604- as -2- sonatas for piano with violin and cello (so these are piano sonatas/trios?... or are those different works? Well, Worldcat has "Three sonatas, for the piano forte; with accompaniments for a violin or flute & violoncello ad libitum" published ca.1793? (not sure about this date from library...) by London: Longman & Broderip (see WorldCat. This may, however, not be the same set of sonatas, but another set published with the same opus number. This would need to be resolved. It is true that such a set of trio/sonatas was reviewed in 1803 as op.29 too, so - could be, could be.)
Sonata 2 has catalog MilC 2.071 (Milligan's thematic catalogue). Don't know the Milligan catalogue numbers of the other 2 sonatas in Op.29.