Karl Marx, Frederick Engels

Comprises fifty vols., organised as follows: vols. 1-27: philosophical, historical, political, economic and other works, in chronological order; vols. 28-29: Marx's economic manuscripts of 1857-58; vols. 30-34: Marx's economic manuscripts of 1861-63; vols. 35-37: Capital, vols. 1, 2 and 3; vol. 48: Engel's letters from January 1887 to July 1890; vol. 49: Engel's letters, 1890-92; vol. 50: Engel's letters, 1892-1895.