Book reviews : Maguire,D.J.,Goodchild,M.F. and Rhind,D.W.,editors,1991: Geographical information systems,principles and applications. London: Longman. Volume 1/ xxix + 649 pp.;Volume 2,xxix + 447 pp. £120.00 cloth. ISBN: 0 470 21789 8

La?? R. and Thompson, D. 1992: Fundamentals of spatial information systems London: Academic Press.