Caves, Richard E. 1931- Trade and economic structure : models and methods / Richard E. Caves. - Cambridge, Mass. : Harvard University Press, c1960. - viii, 317 p. ; 22 cm. - Harvard economic studies ; v. 115 . - Harvard economic studies ; v. 115. . Subjects--Topical Terms: Commerce. Dewey Class. No.: 382 / CAT 1960