TY  - BOOK
AU  - Carl,Etnier  .
AU  - Gutestam,Bjorn  .
TI  - Ecological engineering for waste water treatment / 
SN  - 0873719905
U1  - 628.43 
PY  - 1997///
CY  - New York : 
PB  - Lewis Publishers , 
KW  - ECOLOGICAL ENGINEERING
N1  - Includes bibliographical reference and index
ER  -