TY  - BOOK
AU  - Heywood, Ian ,
AU  - Cornelius , Sarah ,
AU  - Carver, Steve,
TI  - An introduction to geographical information systems
SN  - 9788178089829
U1  - 910.285 
PY  - 2003///
CY  - Delhi
PB  - Pearson Education ( Singapore ) Pvt. Ltd.
KW  - Geographical information system
ER  -