TY  - BOOK
AU  - Heywood,D.Ian
AU  - Cornelius,Sarah
AU  - Carver,Steve
TI  - An introduction to geographical information systems
SN  - 0130611980 (pbk.)
U1  - 910.285 
PY  - 2002///
CY  - Harlow, England, New York
PB  - Prentice Hall
KW  - Geographic information systems
N1  - Includes bibliographical references (p. 267-281)
ER  -