OJ 10/3, [14] Typewritten letter from Otto Erich Deutsch to Schenker, dated August 16, 1920

Deutsch has written to Wilhelm Kux [about his sketchleaf of the "Moonlight" Sonata], and has received a letter from Edward Speyer, in which Speyer explains that he cannot make a copy of his sketchleaf of the "Moonlight" Sonata while in the countryside. Speyer also writes that a further sketchleaf of the "Moonlight" Sonata is held in the Fitzwilliam Museum and has supplied a facsimile. Deutsch asks Schenker if he would like him to write to the Museum to request a photograph of the sketchleaf.

OJ 10/3, [15] Typewritten letter from Otto Erich Deutsch to Schenker, dated September 13, 1920

Deutsch asks Schenker to clarify whether bars are missing from the start of the "Moonlight" Sonata manuscript, as well as from the end. Deutsch outlines Universal Edition's intended format for the volume, and ask if Schenker approves of their proposals. Deutsch has written again to Wilhelm Kux requesting a copy of the sketchleaf, and reminds Schenker to examine the sketchleaf of the Sonata that was reproduced in the Musical Times.

OJ 10/3, [17] Typewritten letter from Otto Erich Deutsch to Schenker, dated November 6, 1920

Deutsch encloses two photographic prints of the Fitzwilliam Museum's "Moonlight" Sonata sketchleaf. Edward Speyer has not yet had his sketchleaf photographed, but has sent a description of its content, which Deutsch passes on.

OJ 10/3, [20] Typewritten letter from Otto Erich Deutsch to Schenker, dated November 26, 1920

Replying to Schenker's postcard of November 20th, Deutsch writes that the connoisseur edition is to be reproduced using photolithography, and repeats the particulars of the Fitzwilliam Museum's "Moonlight" Sonata sketchleaves. Speyer has allowed his sketchleaf of the Sonata to be photographed, and reports that he also owns a letter from Beethoven to Schlesinger (Paris) about corrections to the C minor Sonata (Op. 111). Universal Edition urgently requires a prospectus for the Beethoven day, and so Deutsch asks for sight of the draft of Schenker's Preface.

OJ 89/7, [12] Typewritten letter (carbon copy) from Hoboken to Schenker, dated July 31, 1934

Hoboken assures Schenker that he will support him in his work. — He outlines the restrictions that he has placed on Otto Erich Deutsch, and expresses irritation that Deutsch has been offered a course at the Vienna Academy. — He is annoyed at the political views expressed by E. F. Schmid, who has been appointed at the University of Graz.