TY  - BOOK
AU  - Allen H E Ed.
AU  -  Kramer J R Ed.
TI  - Nutrients in natural waters
T2  - Environmental science and technology
U1  - G9557:(E1:3), L2;1 
PY  - 1972///
CY  - New York    
PB  -  John wiley       
KW  -  Fresh water
KW  - Biology
ER  -