OC 52/402 Typewritten letter from Hertzka (UE) to Schenker, dated March 21, 1909

Hertzka raises several possibilities for amplifying the Instrumentations-Tabelle, and calls for a meeting.

OJ 89/3, [3] Typewritten letter (carbon copy) from Hoboken to Schenker, dated July 7, 1929

Hoboken recounts recent travels. — Is now at Kliffende, where he is about to build a house. — Reports meetings with Hubermann and Harburger; encloses a letter and articles from the latter. — Refers to a Vrieslander problem.

OJ 5/18, 13 Handwritten letter from Schenker to Jonas, dated September 7, 1932

Der freie Satz is complete, and Anthony van Hoboken has volunteered [financial] assistance. Schenker wonders whether van Hoboken might not provide support for Jonas, too.

Diary entry by Schenker for 13 July 1917

Diary entry by Schenker for 28 April 1918

Diary entry by Schenker for 6 May 1918

Diary entry by Schenker for 1 December 1918

Diary entry by Schenker for 4 January 1919

Diary entry by Schenker for 6 April 1919

Diary entry by Schenker for 7 April 1919

Diary entry by Schenker for 8 April 1919

Diary entry by Schenker for 9 April 1919

Diary entry by Schenker for 10 April 1919

Diary entry by Schenker for 11 April 1919