C.F. Peters, n.d. Edition 205. Plate 9792. (Leipzig)

There are four Clavier-Übung volumes by Johann Sebastian Bach, all of them published during his lifetime:Clavier-Übung I, for harpsichord, contains six partitas, BWV 825–830, which were published separately from 1726 to 1730, and then grouped into one publication in 1731 Clavier-Übung II, for harpsichord with two manuals, contains the Italian Concerto, BWV 971 and the Overture in the French style, BWV 831, and was published in 1735 Clavier-Übung III, for organ, contains the Prelude and Fugue in E flat major, BWV 552, 21 chorale preludes, BWV 669–689, and the Four Duets, BWV 802–805, and was published in 1739 Clavier-Übung IV, better known as the Goldberg Variations, for harpsichord with two manuals, was published in 1741
The above text from the Wikipedia article "Clavier-Übung (Bach)" text is available under CC BY-SA 3.0.