OJ 11/54, [15] Handwritten letter from van Hoboken to Schenker, dated August 28, 1927

Hoboken reports on meeting with Furtwängler regarding the Photogrammarchiv, and expresses the hope that it will be possible to interest Furtwängler in performance according to the sources in the Archive; he encloses the final version of the "Aufruf" for the Archive, and discusses negotiations with the Austrian National Library and Ministry of Education. — Comments on Oppel's plan to teach in Leipzig. — Agrees to Schenker's lesson plan and fee for 1927/28. — Describes his travel plans, which include meetings with Louis Koch in Frankurt, Ludwig Schiedermair in Bonn, contact with John Petrie Dunn in England, C. S. Terry in Scotland, and Maurice Cauchie in Paris, and photographing [of sources] at the [Paris] Conservatory.

Diary entry by Schenker for 17 April 1931

Diary entry by Schenker for 15 May 1931

Diary entry by Schenker for 1 June 1931

Diary entry by Schenker for 14 November 1932

Diary entry by Schenker for 13 November 1934