Walton, L. E. Foreign trade and foreign exchange : their theory and practice / L. E. Walton. - 3rd ed. - London : Macdonald & Evans, c 1967. - ix, 310 p. ; ill. ; 22 cm. Includes index. 337 337 Subjects--Topical Terms: Foreign Exchange. Dewey Class. No.: 332.45 / W173f