TY  - BOOK
AU  - Downing, J. A.(ed.)
ED  - Rigler, Frank H.(ed.)
TI  - A Manual on methods for the assessment of secondary productivity in fresh waters
SN  - 0632006161
U1  - 574.52632 
PY  - 1971///
CY  - Boston :  
PB  - Blackwell Scientific Publications
ER  -