TY  - BOOK
AU  - Horan,N.J.
TI  - Biological wastewater treatment systems: theory and operation 
SN  - 0471922587 
AV  - TD755 .H78 1990
PY  - 1990///
CY  - New York 
PB  - John Wiley & sons
N1  - Includes bibliographical references
ER  -