Grady, C. P. Leslie. , Biological wastewater treatment / C. P. Leslie Grady, Glen T. Daigger and Henry C. Lim. - 2nd ed. rev. and expanded. - Environmental science and pollution control ; 19 . ISBN: 0824789199 Subjects--Topical Terms: Sewage --Purification --Biological treatment. LC Class. No.: TD755 / .G72 1999