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MOTION PICTURES 135 Act; financial and technical problems of airport planning, design, construction and operation. (36 minutes, color; also b&w) 7,41 Our White Pine Heritage U.S. Department of Agriculture, 1948. (White Pine Blister Rust Series) Story of white pines of Northeast States; their economic and scenic value; danger of blister rust and needed controls. (12 minutes, color) 1, 32, 41 Outbreak U.S. Department of Agriculture, 1949. Documentary history of foot-and-mouth disease from earliest history to Mexican outbreak in 1947; U.S. and Mexican control programs. (29 minutes, color; also b&w) 32, 41 Overhauling Camshaft Assembly and Crank case Section U.S. Office of Education, 1945. (Air- craft Work Series. Power Plant Main- tenance) How to inspect the camshaft and gear case cover assembly parts; in- spect and recondition the crankcase section; measure crankcase bearings; in- spect and recondition the remaining parts. Supplementary filmstrip, same title, also available. (OE 270; 19 min- utes) 32, 41 Overhauling Crankshaft Assembly U.S. Office of Education, 1945. (Aircraft Work Series. Power Plant Maintenance) How to clean the parts of a disassembled engine; inspect and recondition crank- shaft assembly parts; determine clear- ances and check for out-of-round; and check the clearances against specifica- tions. Supplementary filmstrip, same title, also available. (OE 269; 19 min- utes) .... 32, 41 Overhauling the Carburetor U.S. Office of Education, 1945. (Aircraft Work Series. Power Plant Maintenance) How to remove the carburetor assembly from the engine; disassemble, clean, in- spect, and reassemble the carburetor; check the fuel level; and reinstall the carburetor assembly. Supplementary film- strip, same title, also available. (OE 267; 23 minutes) 32, 41 Oversea Mission U.S. Department of the Army, 1946. Duties facing the Armies of Occupation essential to the security of the United States and world peace. (OF 18; 10 minutes) 41 Overtaking at Night U.S. Department of the Navy, 1943. (Rules of the Nautical Road Series) Correct whistle signals in overtaking situation on ocean and inland waters. (MN 202-q; 15 minutes, color) 41 Overtaking Situation U.S. Department of the Navy, 1943. (Rules of the Nautical Road Series) Whistle signals for overtaking on ocean, inland waters, and narrow channels. (MN 202-n; 15 minutes) 41 Ovulation, Fertilization, and Early Development of the Mammalian Egg U.S. Department of Agriculture, 1935. Time-lapse cinematography of ovulation, fertilization, early development oi mam- malian (rabbit) egg. Sound version "In the Beginning", and short sound version "How Animal Life Begins", also avail- able. (25 minutes, silent) 32, 41 The Oxy-Acetylene Flame: Master of Metals U.S. Bureau of Mines in cooperation with International Acetylene Association, 1950. Principles of the oxy-acetylene flame and its uses in modern industry; welding, soldering, brazing, treating, and hardening. (19 minutes, color) 17 Oxyacetylene Welding Light Metal U.S. Office of Education, 1944. (Welding Procedures Series. Oxyacetylene Welding