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132 U.S. GOVERNMENT FILMS history since Louisiana Purchase, 1803; modern mining, agriculture, industries, educational and religious institutions, cities, transportation, and natural scen- ery. (26 minutes) 17 011 Larviciding U.S. Public Health Service, 1945. (Ma- laria Control Series) Equipment, pro- cedures, value, and disadvantages of oil as a larvicide. Animation. (CDC-4-017; 12 minutes, color) 27 The Oilgear Hydraulic Traversing Mechanism: Principles of Operation U.S. Department of the Army, 1944. How oilgear traverse mechanism operates; path and effectiveness of oil through elevated mechanism. Working model and animation. (TF 9-1376; 21 minutes) 41 One Lick Method of Fire Line Con- struction U.S. Department of Agriculture, 1938. Training film on progressive method of fire line construction and fire suppression. Former title "One Lick Method of Fighting Forest Fires." (31 minutes) 3, 32, 41 On Your Feet U.S. Public Health Service in coopera- tion with Melville Shoe Corporation, 1944. Importance of walking correctly and comfortably: good posture; properly fitted shoes; how to walk correctly; how shoes should fit. (10 minutes) 32 Once a Marine U.S. Marine Corps, 1947. Activities of former Marine and high school student in Marine Corps Reserve. (17 minutes) 15 One Man Task Force U.S. Department of the Navy, 1947. Importance and variety of use of long range shore-based air in the Navy. (MN 5355; 38 minutes) . 14 Only a Bunch of Tools U.S. Department of Agriculture, 1949. Training film on use of small tools in forest fire fighting. (28 minutes, color) 3, 32, 41 Operation Crossroads U.S. Department of the Navy, 1949. Chronological report of the Able and Baker tests at Bikini. Produced by Joint Army-Navy Task Force One. Revision. (MN 6817; 26 minutes, color; also b&w.) 14, 32, 41 Operation of a Forest Nursery U.S. Department of Agriculture, 1948. Varied jobs of large nursery; seed treat- ment and storage; germination tests; sowing; care of seedlings; and field planting. (11 minutes) 3, 32, 41 Operation of DUKWS: Tactical Use U.S. Department of the Army, 1948. Tactical use of dukws in operation; launching from shipboard, loading cargo at shipside out in the water; subsequent water to land operation and beaching; reverse procedure also. (TF 55-1477; 32 minutes) 41 Operation of Ocean Station Vessel During Search and Rescue U.S. Coast Guard, 1947. (Search and Rescue Series) Weather duties of Ocean Station Vessels; their relation to all overseas flying; operation of automatic radiobeam by OSV; radar-plotting of crippled land plane enroute to Europe from Bermuda; ditching of plane near OSV; search by patrol plane; rescue by boats from OSV. (30 minutes, color) 41 Operation of the Landing Gear of the AT-9 U.S. Department of the Air Force, 1943. Hydraulic principles and mechanical operation of working parts of retractable landing gear system of AT-9 airplane. Animation and pictorial sequences. (TF 1-725; 8 minutes) . 7