TY  - GEN
AU  - Heywood , Ian
AU  - Cornelius , Sarah ;Carver , Steve
TI  - An introduction to geographical information systems
SN  - 9814053228
U1  - 025.0691 
PY  - 1998///
CY  - Essex
PB  - Longman 
KW  - GIS
KW  - LIBRARY AND INFORMATION SCIENCE
KW  - GEOGRAPHICAL INFORMATION SYSTEMS
KW  - INFORMATION SYSTEMS-GEOGRAPHY
ER  -