Iwai, Shigehisa. Wastewater treatment with microbial films / Shigehisa Iwai, Takane Kitao - Lancaster : Technomic Publishing, c1994 - viii, 184 p. : illus ; 23 cm. ISBN: 1566761123 Subjects--Topical Terms: Sewage--Purification--Fixed-film biological process. Dewey Class. No.: 628.352 / I96W