TY  - GEN
AU  - Heywood , Ian
AU  - Cornelius , Sarah
AU  - Carver , Steve
TI  - An introduction to geographical information systems
SN  - 8178089823
U1  - 910.285 
PY  - 2002///
CY  - New Delhi
PB  - Pearson education
KW  - INFORMATION SYSTEMS
KW  - GEOGRAPHY
KW  - GEOLOGY
KW  - GIS GEOGRAPHICAL INFORMATION SYSTEMS
ER  -