TY  - BOOK
TI  - Biological methods for the assessment of water quality; : : a symposium presented at the seventy-fifth annual meeting, American Society for Testing and Materials 
SN  - (hbk.)
U1  - 628.161 
PY  - 1973///
CY  - Philadelphia
PB  - American Society For Testing And Meterials
KW  - Water quality biological assessment
N1  - includes index
ER  -