Federn, Karl, 1868-1942. The materialist conception of history : a critical analysis / by Karl Federn. - London : Macmillan and Co., 1939. - xiv, 262 p. ; 23 cm. includes index. Subjects--Personal Names: Marx, Karl, 1818-1883. Subjects--Topical Terms: History--Philosophy Dewey Class. No.: 901.1 / FEM 1939