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210 U. S. GOVERNMENT FILMS servation methods to remedy either situ- ation. (11 minutes) 4, 32, 41 Water for a Nation U.S. Department of Agriculture, 1949. Value of soil and water conservation to farmers and nation; conservation prac- tices for farmers and ranchers in different regions of country. (19 minutes} 4, 32, 41 Water, Friend or Enemy U.S. Coordinator of Inter-American Af- fairs, 1943. Importance of pure water and correct measures in keeping spring and well water from being contaminated. Suggests boiling of water as a final pre- caution. An animated cartoon. Portuguese version "A Aguas: Nosso Amigo Oui- nimigo" and Spanish version "Agua, Amiga o Enemiga" also available. (9 minutes, color) 32, 37 Water in the West U.S. Bureau of Reclamation, 1951. How men have overcome desert, droughts, and floods; how conservation and use of water resources through multiple-purpose dams, canals, hydropower facilities, etc., have transformed West. (27 minutes) 18 Water on the Land U.S. Institute of Inter-American Affairs, 1947. How irrigation increases crop pro- duction. Demonstrates simple methods of conservation and distribution any farmer may apply to land near a supply of water. Portuguese version "Irrigue a Terra" and Spanish version "Regando la Tierra" also available. (9 minutes, color) 32, 37 Watertight Cover. Part 1: Layout and Fabrication U.S. Department of the Navy, 1944. (Shipbuilding Skills Series. Sheetmetal Work) How to construct a type F round watertight cover; overall fabrication of lid, hinge, dogs, collar, gasket and comb- ing; complete cover ready for assembly. Full scale, detailed drawings. Supplemen- tary filmstrip, same title, also available. (MN 2339-b; 13 minutes) 41 Watertight Cover. Part 2: Assembly U.S. Department of the Navy, 1943. (Shipbuilding Skills Series. Sheetmetal Work) How to weld and assemble comb- ing, lid and collar, locking device, dogs, hinge, screen, and rubber gasket; how chalk test proves correct construction of watertight cover. Supplementary film- strip, same title, also available. (MN 2339-c; 18 minutes) 41 Wealth of the Andes U.S. Coordinator of Inter-American Af- fairs, 1943. Cerro de Pasco mining dis- trict in Peruvian Andes; copper and lead mines; Central Railway of Peru. (19 minutes, color) 32, 41 Wearing of the Uniform U.S. Department of the Army, 1948. How smart appearance while wearing the uniform and good personal conduct of the individual soldier affect his well- being. (TF 19-1485; 20 minutes) 41 Weather Duties U.S. Coast Guard, 1947. (Search and Rescue Series. Ocean Station Vessel Crew Training in Search and Rescue) OS Vessel weather duties; their relation to oceanic air travel; how plane avoids weather-front after OSV warning; radar tracking of weather-balloon; radio trans- mission of weather-data back to Weather Bureau. (5 minutes, color) 41 Weather for the Navigator U.S. Department of the Navy, 1944. How each navigator is a member of a vast network of observers, sending his limited information by radio to profes- sional forecasters at weather centrals. 7 (MN 3112-a; 9 minutes)