TY  - BOOK
AU  - Mason,C.F.
TI  - Biology of freshwater pollution
SN  - 9780582455962
U1  - 628.168 
PY  - 1981///
CY  - London
PB  - Longman
KW  - Water -- Pollution
KW  - Freshwater biology
N1  - Includes indexes
ER  -