TY  - BOOK
AU  - Heywood, Ian
AU  - Carver, Steve
AU  - Cornelius, Sarah
TI  - An introduction to geographical information systems
SN  - 9780273722595
U1  -  910.285 
PY  - 2011///
CY  - Harlow,England
PB  - Pearson Education
KW  - Geographical information systems
ER  -