Lo, C P. Concepts and techniques of geographic information systems / by C P Lo and Albert K W Yeung. - 2nd ed. - New Delhi : PHI Learning , 2009. - xii,532p. : ills.,charts.,picts ; 28cm ISBN: 9788120339149 Rs.450.00 Subjects--Index Terms: GIS Dewey Class. No.: 910.285 / LO/C