Economics of transportation. /
Locklin, David Philip, 1897-
Economics of transportation. / David Philip Locklin. - 6th ed. - Homewood, Ill. : R. D. Irwin, 1969. - 882 p. 25 cm. - The Irwin series in economics .
Transportation--United States.
Railroads--United States.
380.5 / LOE 1969
Economics of transportation. / David Philip Locklin. - 6th ed. - Homewood, Ill. : R. D. Irwin, 1969. - 882 p. 25 cm. - The Irwin series in economics .
Transportation--United States.
Railroads--United States.
380.5 / LOE 1969