43. For an explanation of this arrangement with Breitkopf, see Clark, Letters, xxxv–xxxvi; and, more fully, Clark, “C. P. E. Bach as a Publisher of His Own Works,” in Carl Philipp Emanuel Bach: Musik für Europa, ed. Hans-Günter Ottenberg (Frankfurt [Oder]: Konzerthalle “Carl Philipp Emanuel Bach,” 1998), 199–211; and Peggy Daub, “The Publication Process,” 71–77.