na INLIS000000000008190 Ind 0010-1118008190 Water supply and pollution control CLARK, John W. John W. Clark; Warren Viessman Jr. ... [et al.] London International Textbook 1971 661 p. : ill. ; 18 cm. 661 p. : ill. ; 18 cm. 628.19CLAw Index: p. 651 628.19 WATER SUPPLY POLLUTION CONTROL 567/79