@book{695408,
	author = {Dutton Geoffrey Ed. and International Advanced Study Symposium On Topclogical Data Structures For Geographic. Information Systems Massachusetts (1st) (1977) and International Advanced Study Symposium On Topclogical Data Structures For Geographic. Information Systems Massachusetts (1st) (1977)},
	title = {Harvard paper on geographic information systems.},
	publisher = {Harvard College      },
	year = {1978},
	series = {"Harvard University, Laboratory For Computer Graphics And Spatial Analysis Publication"},
	address = {Harvard}
}