Al-Nozaily, Fadhl Ali Performance and process analysis of duckweed-covered sewage lagoons for high strength sewage : the case of Sana'a, Yemen Fadhl Ali Al-Nozaily - Rotterdam A.A. Balkema 2001 - xiv, 248 p. : ill., map ; 25 cm Vita. Dissertation ISBN: 9789054104254 Subjects--Topical Terms: Sewage lagoons Dewey Class. No.: 628.43 AL