00918nam a2200229Ia 4500003000400000005001700004006001800021007000300039008004100042024001100083037002600094040001800120041001300138082002800151100002400179110013700203245005300340260004100393490009600434650002100530700013700551OSt20220927110122.0a|||||r|||| 00| 0ta220926b        |||||||| |||| 00| 0 eng d  a129353  cReference Collections  aRTLcRTLbeng  2engaeng  a"U:(B2893)p1,N77, L8.3"  aDutton Geoffrey Ed.  aInternational Advanced Study Symposium On Topclogical Data Structures For Geographic. Information Systems Massachusetts (1st) (1977) 0aHarvard paper on geographic information systems.  aHarvardbHarvard College      c1978  vV1a"Harvard University, Laboratory For Computer Graphics And Spatial Analysis Publication"  aModern Geography  aInternational Advanced Study Symposium On Topclogical Data Structures For Geographic. Information Systems Massachusetts (1st) (1977)