00322nam a2200109Ia 4500008004100000020002200041040002900063050002600092100002100118245005100139260002200190221216s9999||||xx |||||||||||||| ||und||  a978-0-19-823365-7  cChuka University Library  aG 70.21 b .B87 1998   aBurrough,Peter A 0aPrinciples of geographical information systems  aOUPbOxfordc1998