Downing, Paul B. The economics of urban sewage disposal / [by] Paul B. Downing. - New York : Praeger, 1969 - xvii, 195 p.: illus. 25 cm. - Praeger special studies in U.S. economic and social development . Bibliography: p. 189-195. LCCN: 69015590 Subjects--Topical Terms: Sewage disposal. Dewey Class. No.: 628.3 / DOE 1969