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.

This volume contains the writings of Marx and Engels on revolutionary struggles in nineteenth-century Spain. Also included is The Moorish War (1859-1860) by Frederick Engels and The Bakuninists at Work, also by Engels.