00309pam a2200109 a 4500020000500000041000500005082001300010100005100023245007600074260003600150300001300186  c  h  a658.4038  aHEYWOOD (I) / CORNELIUS (S) CARVER (S)eauthor  aAn Introduction to Geographical Information Systems  hTextual Document  bLONGMAN SCINTIFIC TECH. Ec2000  aXIII,279