TY  - GEN
AU  - Heywood, Ian
AU  - Cornelius, Sarah
AU  - Carver, Steve
TI  - An introduction to geographical information systems
SN  - 9780130611987
U1  - 910.285 
PY  - 1998///
CY  - Essex
PB  - Pearson Education
KW  - Geography
KW  - Information systems
ER  -