Text ( visual ) : unmediated The economics of transport / by Michael R. Bonavia ; with an introduction by J.M. Keynes. -- London : Nisbet ; Cambridge : Cambridge University Press , 1936. -- x, 202 p. ; 20 cm. -- (Cambridge economic handbooks ; 9). -- Includes index. -- (BA20858422) ; https://ci.nii.ac.jp/ncid/BA20858422 Author Heading(s): Bonavia, Michael Robert