=LDR 22 4500 =001 1451 =082 04$a388 GWI =100 1\$aGwilliam, K. M. =245 10$aEconomics and transport policy =260 \\$aLondon :$bAllen and Unwin,$c1977 =650 \0$aBooks =700 1\$aMackie, P. J. =852 \\$bFreeman Library$h388 GWI