TY  - BOOK
AU  - Heywood,D.Ian
AU  - Carver,Steve
AU  - Cornelius,Sarah
TI  - An introduction to geographical information systems
SN  - 9780273722595
PY  - 2011///
CY  - Harlow, England ; , Toronto : 
PB  - Prentice Hall, 
KW  - Geographic information systems
N1  - Includes bibliographical references and index
ER  -