TY  - BOOK
AU  - Mason,C.F.
TI  - Biology of freshwater pollution
SN  - 0582455960
U1  - 628.1/68 
PY  - 1981///
CY  - London, New York
PB  - Longman
KW  - Water
KW  - Freshwater biology
N1  - Includes indexes
ER  -