00393nam a2200157Ia 4500008004100000041000800041082001700049100001700066245005000083250001200133260002100145300002500166365001600191500001100207700001700218230718s9999    xx            000 0 und d  aeng  a910.285bDEM  aDemers M. N.  aFundamentals Of Geographic Information System  a2nd ed.  c1997bJohn Wiley  a486dRef 49 G (9790)  cRs.b786.20  a49 GEN  aDemers M. N.