Heilperin, Michael A. The trade of nations / Michael A. Heilperin - 2nd. enl. ed. - New York : Alfred A. Knopf , 1952 - xix, 302, ixp. : ill. ; 23 cm. Includes bibliographical references and index. Subjects--Topical Terms: International economics Dewey Class. No.: 382 / HEI-2