VOLUME 7
The Berlin Years: Writings, 1918–1921
edited by Michel Janssen, Robert Schulmann, József Illy, Christoph Lehner,
and Diana Kormos Buchwald (2002)
VOLUME 8
The Berlin Years: Correspondence, 1914–1918
edited by Robert Schulmann, A. J. Kox, Michel Janssen, and József Illy (1998)
VOLUME 9
The Berlin Years: Correspondence, January 1919–April 1920
edited by Diana Kormos Buchwald, Robert Schulmann, József Illy,
Daniel J. Kennefick, and Tilman Sauer (2004)