TY  - BOOK
AU  - Treweek J O
AU  -  Wadsworth Richard
TI  - GIS for ecology:  An introduction   
SN  - 0582246520
U1  - U:(D,9(B), N9 
PY  - 1999///
CY  - Essex
PB  - Addison Wesley         
KW  - Geography irt Computer Science
ER  -