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1Archief 'Belgische afdeling van de Vierde Internationale' Administratie: 150 Fifth Ave, Rm. 737, New York
Date 1972 -
2Wijziging ondertitel: 1929: a magazine of the theory and practise of Marxism Leninism published monthly by the Communist Party of ...“…Wijziging ondertitel: 1929: a magazine of the theory and practise of Marxism Leninism published monthly by the Communist Party of the United States of America…”
Date 1928-1929