TY  - BOOK
AU  - Golterman  H.L.
AU  - By Clymo R.S.,ed.
AU  - By Ohnstad M.A.M.,ed.
TI  - Methods For Physical and Chemical Analysis Of Fresh Waters 
SN  - 0632004592
PY  - 1969///
CY  - London 
PB  - Black Well Scientific Publication 
ER  -