Problems in marketing / Edmund P. Learned. Learned, Edmund P. (Edmund Philip), 1900-1991. Copeland, Melvin Thomas, 1884-1975. Problems in marketing. Marketing. Retail trade. Selling. Advertising. 658.81 LEP New York : London : McGraw-Hill, 1936. 1936. 1936 Text xx, 669 p. : eng Harvard problem books