TY  - BOOK
AU  - Wetzel, Robert G  .
TI  - Limnology: lake and river ecosystems / 
SN  - 0-12-744760-1
U1  - ND,2540t256:(G:5) 
PY  - 2001///
CY  - London : 
PB  - Academic Press , 
KW  - Limnology
ER  -