=LDR 22 4500 =001 2921 =082 04$a910.0151 O'B =100 1\$aO'Brien, L. G. =245 10$aIntroducing quantitative geography =260 \\$aLondonLondon :$bRoutledge,$c1992 =650 \0$aBooks =852 \\$bFreeman Library$h910.0151 O'B