Vols. 35-37 contain volumes I, II, and III of Das Kapital. Vols. 36-37, 48-50 prepared jointly by Lawrence & Wishart Ltd., London, International Publishers, and Progress Publishing Group Corp., Moscow, in collaboration with the Russian Independent Institute of Social and National Problems. Vols. 38-41 published: Moscow : Progress Publishers. Includes bibliographies and indexes.

For the first time their writings are being made fully available in English, including manuscripts not published during their lifetime, their correspondence as well as supplementary notes, outlines and projects. Fully annotated and with bibliographical data and indexes. The set will be 50 volumes.