TY  - BOOK
AU  - Heywood, Ian .-
AU  - 
TI  - An Introduction to Geographical Information Systems
SN  - 9788178089829
U1  - 910.285 HEY 
PY  - 2002///
CY  - Delhi
PB  - Pearson education publishers
KW  - Geographic information systems
N1  - includes; bibliographical references and indexes
ER  -