Cropsey, Myron George, 1910-; Weswig, Paul H. (Paul Henry), 1912- (Corvallis : Agricultural Experiment Station, Oregon State University, 1973-02)
Douglas-fir bark, 3/4 inch and 1 1/2 inch in size, was tested in recirculating
trickling filters 1, 2, and 3 feet in depth, hydraulically loaded at 2.27, 4.54, and
9.08 gallons per minute per square foot (gpm/sq.ft.) w ...