Burrough, P. A. Principles of geographical information systems / by Peter A. Burrough and Rachael A. McDonnell. - New York : Oxford University Press, 1998. - xiii, 333 p. : ill. ; 25 cm. - Spatial information systems . ISBN: 0198233655 Subjects--Topical Terms: Geographic information systems. Dewey Class. No.: 910.285 BUR