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Operation and maintenance of standard and high-rate trickling filter plants: separation of solids; economics of plants and type of operator required; and, comparison of resulting effluent discharge to original raw sewage of other und plants. (CDC-5-159; 94 frames, synchronized disc, 9 minutes) 1944. 27 The Triode: Amplification U.S. Office of Education, 1945.; (Engineering Series. Electronics No. 3) Reviews material presented in motion picture, same title