Bibliographic data is not specified. — 2 p.
Anton Pannekoek’s letter to Paul Mattick (26 May 1949) on the differences between Marxism and anarchism. The original version of the letter is in International Institute of Social History (Amsterdam) Archives. (IISG, Pannekoek Archives, F. 108 PP. 8) Below you will find the transcribed copy of the originally hand-written letter.