Labriola, Antonio Essays on the materialistic conception of history / Antonio Labriola. - Chicago : Charles H. Kerr & Company, 1908. - 246 p. ; 19 cm. - 329.15 (NLA) . Subjects--Personal Names: Marx, Karl, 1818-1883 Subjects--Topical Terms: History --PhilosophyMaterialism. Universal Decimal Class. No.: 329.15 (NLA)