Sewage treatment [by] Karl Imhoff [and] Gordon Maskew Fair. Imhoff, Karl, 1876-1965. Fair, Gordon Maskew, 1894-1970. Sewage disposal. Factory and trade waste. TD741 .I57 1956 628.3 IMS New York, Wiley [1956] [1956] 1956 Text 338p. http://www.loc.gov/catdir/enhancements/fy0607/56011025-d.html http://www.loc.gov/catdir/enhancements/fy0607/56011025-t.html eng