The development of rates of postage : an historical and analytical study / by A. D. Smith. Smith, A. D. Postal rates. HE6125 .S6 383.4 SMD includes index. London : G. Allen & Unwin, 1917. 1917. 1917 Text xii, 431 p. : eng Studies in economics and political science ... no. 50 in the series of monographs by writers connected with the London school of economics and political science