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290 U. S. GOVERNMENT FILMS Simple Foundation U.S. Department of the Navy, 1944 (Shipbuilding Skills Series. The Ship- fitter) Reviews material presented in motion pictures, "Simple Foundation, Parts 1, 2 and 3." (SN 2338-n; 98 frames) 41 Simple Valves U.S. Department of the Navy, 1944. (Hy- draulic Valves Series) Five simple hy- draulic valves: gate, globe, needle, check and simple relief; common valve casual- ties; their causes and remedies. (SN 1809-b; 65 frames, synchronized disc, 12 minutes) 7 A Simple Way To Iron a Shirt U.S. Department of Agriculture, 1944. Quick simple method of ironing men's shirts requiring little time; convenient equipment; washing, bleaching, and scrubbing for improved looks; folding to preserve appearance and conserve drawer space. (44 frames: single; also double) 39 Single Ram Vertical Surface Broach- ing U.S. Office of Education, 1945. (Machine Shop Work Series. Operations on a Broaching Machine No. 2) Reviews material presented in motion picture, same title. (OE 237; 48 frames) 41 Single-Phase and Polyphase Circuits U.S. Office of Education, 1945. (Electri- cal Work Series. Electrical Machinery No. 1) Reviews material presented in motion picture, same title. (OE 383; 51 frames) 41 The Slide Rule: "C" and "D" Scales U.S. Office of Education, 1943. Reviews material presented in motion picture, same title. (OE 179; 53 frames) . 41 The Slide Rule: Proportion, Percent- age, Squares and Square Roots U.S. Office of Education, 1944. Reviews material presented in motion picture, same title. (OE 354; 44 frames) 41 Slip Covers for Straight Chairs U.S. Department of Agriculture, 1940. How to measure for amount of material needed, select fabric, cut, fit, and finish. (64 frames) 39 Slip Covers for Upholstered Chairs U.S. Department of Agriculture, 1940. How to measure two types of chairs for amount of material needed; select fabric; cut, fit, trim, finish; and make and use patterns. (65 frames) 39 Soil and Water Conservation by the Beaver U.S. Department of Agriculture, 1938. History, habits, and economic relations of beaver with reference to farm and forest lands; how to establish new colo- nies by live trapping and transplanting. (48 frames) 39 Soil Conservation Benefits Wildlife U.S. Department of Agriculture, 1939. How nature reclaims areas saved by soil conservation providing cover for game, fish and wildlife. (31 frames) 39 Soil Erosion and Its Control in Or- chards U.S. Department of Agriculture, 1941. How run-off and wind ruin orchards by gullying and drifting soil; methods of control including use of brush mulch. (38 frames: single; also double) 39 Soil Erosion in the United States U.S. Department of Agriculture, 1937. How man-made erosion causes vast losses in land and crops and lowers living standards. (48 frames) . 39