TY  - BOOK
AU  - C. H. Walker . S.P. Hopkin R.M. Sibly . D.B. Peakall
TI  - Principles of Ecotoxicology 
SN  - 571.95/PRI
U1  - 571.95/PRI Third Edition 
PY  - 2005///
CY  - Taylor & Francis 
PB  - CRC Yaylor & Francis 
ER  -