TY  - BOOK
AU  - Heywood,Ian  .
AU  - Cornelius,Sarah  .
AU  - Carver,Steve  .
TI  - An introduction to geographical information systems / 
SN  - 8178089823
U1  - 910.01154 
PY  - 1998/// (rep.2001)
CY  - New Delhi : 
PB  - Pearson Education  , 
KW  - GEOGRAPHIC INFORMATION SYSTEMS
N1  - Includes bibliographical references and index
ER  -