=LDR 22 4500 =001 6457 =082 04$a330.015195 =100 1\$aJohnston, J. =245 10$aEconometric Methods 2nd ed. =260 \\$aNew York :$bMcGraw-Hill,$c1972 =650 \0$aBooks =852 \\$bGeography Basement$h330.015195