=LDR 22 4500 =001 2065 =082 04$a526.028 LON =100 1\$aLongley, Paul A. =245 10$aGeographical information systems: Vol 1 principles and techiques =260 \\$aChichester :$bWiley,$c1999 =650 \0$aBooks =700 1\$aGoodchild, Michael F. =700 1\$aRhind, David =700 1\$aMaguire, D. J. =852 \\$bFreeman Library$h526.028 LON