OJ 9/34, [14] Handwritten letter from Cube to Schenker, dated October 4, 1928

Cube acknowledges OJ 5/7a, [18] and [19], and comments; reports on his own recent activities and plans, and on events in the Conservatory, on a forthcoming Schubert festival, and Radio Vienna. He is about to return the Hammer etching.

Diary entry by Schenker for 13 March 1927

Diary entry by Schenker for 21 February 1928

Diary entry by Schenker for 21 October 1928