Heywood,I. An introduction to geographical information systems, Ian Heywood; Sarah Cornelius and Steve Carver - 4th - England: Pearson education, 2011. - xxxiv, 446p.: ill.; 27 cm. includes bibliographical reference, Glossary and index ISBN: 9780273722595 Subjects--Topical Terms: geographic information systems LC Class. No.: DUCE G70.212.H49