TY  - GEN
AU  - Heywood,D.Ian
AU  - Cornelius,Sarah
AU  - Carver,Steve
TI  - An introduction to geographical information systems 
SN  - 0130162388
PY  - 1998///
CY  - Upper Saddle River, N.J.
PB  - Prentice Hall
KW  - Geographic information systems
N1  - Indian print
ER  -