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U. S. GOVERNMENT FILMS reassemble air start check valve, cylinder relief valve and indicator cock; and test cylinder relief valve. (MN 3691-g; 13 minutes) 41 Aircraft Engine and Navigation In- struments: 50 Hour Inspection U.S. Department of the Air Force, 1943. Procedures for 50-hour inspection of engine and navigation airplane instru- ments in B-17; applicable to many other types of aircraft. (TF 1-799; 22 min- utes) 7 Aircraft Quarantine U.S. Public Health Service, 1947. Inter- national air transportation increases pos- sibility of dangerous disease vectors en- tering into U.S. Outlines combative measures and periodic checks. Restricted to public health personnel only. (CDC- 4-045; 15 minutes, color) 27 Aircraft Welding U.S. Department of the Navy, 1942. How to set up welding apparatus, light torch, make ripples and beads; turn off; care for; and put away welding apparatus; different types of flames; their effect on steel. (MN 92; 18 minutes) 7 Aircrewmen of the Navy U.S. Department of the Navy, 1944. Advantages and importance of air gun- nery training; operation of training pro- gram; newly approved status given air- crewmen; aircrewmen's wings; gunner's insignia; flight pay. (MN 3550; 15 min- utes) 41 The Airplane Mechanic U.S. Office of Education, 1945. (Aircraft Work Series. Preventive Maintenance) Orientation film for beginning airplane mechanics; skills and knowledges re- quired to make satisfactory inspections and repairs; importance of thoroughness, skill, and dependability. Supplementary filmstrip, same title, also available. (OE 278; 9 minutes) 7, 32, 41 Airplanes: Their Metals, Fuels, and Lubricants U.S. Bureau of Mines in cooperation with Sinclair Refining Co., 1944. Boys build- ing airplane models shown learning theory of flight, construction of plane and engine, aerodynamics, effects of drag, thrust, lift, and gravity, and maintenance of planes. (37 minutes) 17 Airways Flying U.S. Department of the Air Force, 1942. (Aerial Navigation Series) Procedures for flying civil airways; operations at air traffic control center and tower; meaning of green, amber, red, and blue airways; recommended procedures when navigation instruments fail; rules for approaching and leaving airports. (Cer- tain parts of this film are obsolete.) (TF 1-328; 38 minutes) 7 Alaska Sportfishing U.S. Fish and Wildlife Service, 1947. Views of glaciers, totem poles, and other scenes in SE. Alaska; how to fish for cut-throat and Dolly Varden trout and salmon. (75 minutes, color, silent) 20 Alaska's Fisheries and Fur Seals U.S. Fish and Wildlife Service, 1947. Commercial fishing for canneries of her- ring, King crab, and salmon on way to spawning grounds; hunting surplus seals for fur on Pribilof Islands; views of hump-backed whale. (15 minutes, color, silent) 20 Alaska's Game and Fur Bearers U.S. Fish and Wildlife Service, 1947. Alaskan game birds and mammals; ptar- migan; geese; ducks; Dall's mountain sheep; mountain goats; caribou; and grizzly and great brown bears. (15 min- utes, color, silent) .20