TY  - BOOK
AU  - Wadsworth Richard 
AU  - Treweek Jo 
TI  - Geographical information systems for ecology : : an introduction 
SN  - 0582246520
U1  - 910 WAD 
PY  - 1999///
CY  - England , 
PB  - Longman
N1  - Includes references and index.
ER  -