TY  - BOOK
AU  - Heywood,Ian
AU  - Cornelius,Sarah
AU  - Carver,Steve
TI  - An introduction to geographical information systems
SN  - 0582089409
PY  - 1997///
CY  - London
PB  - Addison Wesley Longman
KW  - Geographic information systems
N1  - References: p. 253-266
ER  -