Locklin, D. Philip 1897- Economics of Transportation / D. Philip Locklin. - 5th ed. - Homewood; Ill. : R. D. Irwin, c1960 [Printing 1963]. - xi, 874 p. : ill. ; 23 cm. - The Irwin series in economics . Includes bibliography and index. Subjects--Topical Terms: Transportation.--United States. Dewey Class. No.: 388.0973 / LOE 1963