TY  - BOOK
AU  - Downes, Barbara J
TI  - Monitoring ecological impacts : concepts and practice in flowing waters
SN  - 9780521065290
U1  - 577.640287 DOW 
PY  - 2002///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Stream ecology
KW  - Water quality biological assessment
N1  - Includes bibliographical references (p. 392-420)
ER  -