Marx/Engels Collected Works (also known as MECW) is the largest existing collection of English translations of works by Karl Marx and Friedrich Engels. Its 50 volumes contain publications by Marx and Engels released during their lifetimes, many unpublished manuscripts of Marx's economic writings, and extensive personal correspondence. The Collected Works, for the most part compiled by the Institute of Marxism-Leninism of the CC CPSU, was issued from 1975 to 2004 by Progress Publishers (1931, Moscow) in collaboration with Lawrence and Wishart (1936, London) and International Publishers (1924, New York City). Source: Wikipedia (en)