TY  - BOOK
AU  - Worrall,Les
TI  - Geographic information systems: developments and applications 
SN  - 185293140X
U1  - 910.285 20
PY  - 1990///
CY  - New York
PB  - Belhaven Press
KW  - Geographic information systems
N1  - Includes bibliographical references and index
ER  -