00694cam a2200229 a 45000010008000000030004000080050017000120080041000290400019000700820022000891000020001112450069001312600047002003000047002473360009002943370015003033380011003184400022003295040020003516500036003716500057004074489744OSt20241128140855.0970609s1998    enka     b    001 0 eng    aDLCcDSSCdDLC00aCir./910.285/W151  aWalker, Melissa10aPrinciples of geographical information systems /cMelissa Walker  aNew York :bClanrye International,cc2022.  aviii, 237 pages :billustrations ;c25 cm.  atext  aunmediated  avolume  aEdu-Tech learning  aIncludes index. 0aGeographic information systems. 0aInformation storage and retrieval systemsxGeography