TY  - BOOK
AU  - Downing, John A.
AU  - Rigler, Frank H.
TI  - A MAnual on Methods for the Assessment of Secondary Productivity in Fresh Water
SN  - 0632006161
U1  - 574.52632 
PY  - 1984///
CY  - Oxford
PB  - Blackwell Scientific Publications
ER  -