TY  - BOOK
AU  - Heywood, Lan and others
TI  - An introduction to geographical information systems
SN  - 8177587846
U1  - 910.285 
PY  - 2006///
CY  - New Delhi
PB  - ; Pearson Education
KW  - Geographical Information Systems
KW  - Geography
KW  - Gis
ER  -