TY  - GEN
AU  - Jeffries, Michael
AU  - Mills, Derek
TI  - Freshwater ecology : principles and applications
SN  - 8123900422
U1  - 577.6 
PY  - 1990///
CY  - New Delhi
PB  - CBS publishers
KW  - Freshwater ecology
KW  - Life sciences    Biology
KW  - Ecology
ER  -