Johnson, Emory R. Transportation : economic principles and practices / Emory R. Johnson, Grover G. Huebner & G. Lloyd Wilson - New York : Appleton-Century Company , 1940 - xi, 678p. : ill. ; 23 cm. Includes bibliographical references and index. Subjects--Topical Terms: Transport and communicationsTransport Dewey Class. No.: 385 / JOH