MALTHUS, T.R. An Essay on the Principle of Population, London: for J. Johnson, 1807, 2 vols., 8°, fourth edition, later 19th-century half calf (spines defective, corners bumped, joints weak) -- SMITH, Adam. An Inquiry into the Nature and Causes of the Wealth of Nations, Edinburgh: 1819, 3 vols., 8° (some light offsetting), contemporary cloth (worn) -- MILL, John Stuart. Principles of Political Economy, London: John W. Parker and Son, 1852, 2 vols., 8°, third edition, recent cloth. (7)