Welch, E. B. Ecological effects of waste water / E.B. Welch ; with hydrographic characteristics by T. Lindell. - Cambridge [Eng.] ; New York : Cambridge University Press, 1980. - xii, 337 p. : ill. ; 24 cm. Includes index. H.B Bibliography: p. [310]-327. ISBN: 0521224950. 0521295254 LCCN: 78011371 Subjects--Topical Terms: Sewage--Environmental aspects. LC Class. No.: QH545.S49 / W44 Dewey Class. No.: 574.5263 WEL