TY  - BOOK
AU  - JHON A DOWNING
TI  - A MANUAL ON METHODS SFOR THE ASSESSMENT OF SECONDARY PRODUCTIVITY IN FRESH WATERS
SN  - 0632006161
U1  - 574.52632 D 757 
PY  - 1984///
CY  - OXFORD
PB  - BLACKWELL SCIENTIFIC PUBLICATIONS
KW  - A MANUAL ON METHODS SFOR THE ASSESSMENT OF SECONDARY PRODUCTIVITY IN FRESH WATERS
N1  - MODERN BOOK HOUSE
ER  -