Letters by Paul Mattick to Dinsmore Wheeler 1945-1968 and correspondence (for the most part incoming letters) with Guy Aldred 1935, Walter Auerbach 1935-1941, Lelio Basso 1966-1978, Rdiger Blankertz 1969-1971, Serge Bricianer 1960-1980, Michael Buckmiller 1971-1977, Paul Buhle 1967-1971, Edward Conze 1933-1935, Max Eastman 1934-1948, Willi Eichler (pseudonym Martin Hart) 1937, Paul Frölich 1939, 1941, Henryk Grossmann 1931-1937, Hellmut G. Haasis 1972-1979, Leif Hansen 1972-1980, Wieland Herzfelde 1927-1935, 1965-1968, 1974, Sidney Hook 1933-1937, Reinhold Klingenberg 1929-1947, 1962, 1965, Gabriel Kolko 1970-1979, Walter Laqueur 1964, 1966, Leo Lòwenthal 1934-1937, Klaus Mann 1934, 1941, Herbert Marcuse 1962-1969, Barrington Moore 1964-1969, Otto Morf 1970-1975, Max Nomad 1933-1934, Claudio Pozzoli 1968-1980, Emmy Rosdolsky 1968-1978, Easton Rothwell 1937-1938, Maximilien Rubel 1960-1980, Otto Rùhle 1938-1940, Daniel Saint-James 1961-1971, A.C. Tovell 1966-1980, Alfred Weiland 1930-1931, 1946, 1971, 1973, Karl A. Wittfogel 1946-1949 and others; manuscripts and drafts of essays, including `History of Illinois since 1818' 1937, `Unemployment and relief in Illinois' 1939, `Marx's Labor Theory of Value' 1963,`Marx and Keynes. The limits of the mixed economy' [1969], `Marxism: last refuge of the bourgeoisie?' edited by his son Paul Mattick Jr. 1982, `The new nationalism and the old imperialism' n.d., `Anton Pannekoek and the world revolution' n.d., `Lineaments of the labor movement in Europe and North America' n.d., `Rosa Luxemburg in retrospect' n.d. and other works; excerpts, some reviews and notes.