TY  - BOOK
AU  - Heywood Ian
TI  - An introduction to geographical information sysytems
SN  - 0582089409
AV  - G70.212 .H49 1998 
PY  - 1998///
CY  - New York
PB  - Longman
KW  - geographical information systems
N1  - includes index
ER  -