TY  - BOOK
AU  - Davis,Wayne S.
AU  - Simon,Thomas P  .
TI  - Biological assesment and criteria / 
SN  - 0873718941
U1  - 363.7394 
PY  - 1994///
CY  - London : 
PB  - Lewins Publishers , 
KW  - WATER QUALITY BIOLOGICAL ASSESSMENT
N1  - Includes bibliographical references and index
ER  -