TY  - BOOK
AU  - Jeffries,Mike J.
AU  - Mills,Derek Henry
TI  - Freshwater ecology: principles and applications 
SN  - 1852930217 :
U1  - 574.52632 22
PY  - 1990///
CY  - London, New York
PB  - Belhaven Press
KW  - Freshwater ecology
KW  - Nature
KW  - Effect of human beings on
ER  -