TY  - BOOK
AU  - Heywood,Ian
TI  - An introduction to geographical information systems
SN  - 0131293176
AV  - G70.212.H49 
PY  - 2006///
CY  - England: 
PB  - Pearson Education Limited, 
KW  - Geographic information system
N1  - Includes bibliographical references and Index
ER  -