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82 U.S. GOVERNMENT FILMS educational use in the United States. (38 minutes) 32, 41 A Heritage We Guard U.S. Department of Agriculture, 1940. Early exploitation of wildlife and land by trappers and settlers; resultant de- nudation, soil erosion and dust storms; interrelation of wildlife and soil con- servation. (30 minutes) 4, 32, 41 Hidden Power U.S. Economic Cooperation Administra- tion, 1950. How E.C.A. financing and imported American machinery have har- nessed the hot steam and natural gases of Tuscany to turn electric turbines and produce, as a by-product, borax for export. (10 minutes} 24 The Hidden Army U.S. Department of the Army, 1944. Adolf Hitler in allied prison after war, writes in his memoirs his underestimation of American woman power in war in- dustry. How American women produced weapons and material. (WF 25; 17 min- utes) 41 High Frequency Soldering U.S. Office of Education, 1944. (Acces- sory Assembly Series. Tools and Pro- cedures No. 2) Theory of high frequency heating; how to select work coil and leads; tune a converter; determine cor- rect soldering time and temperature; and use an automatic timer. Supplementary filmstrip, same title, also available. (OE 480; 17 minutes) 32, 41 High Impact Shock on Electrical Equipment U.S. Department of the Navy, 1944. Effect of near-miss explosions on ships; results of high pressure vibrations and direct hit; factory testing of equipment for shock proof qualities; danger of near-miss explosions. Straight photography and animation. (MN 3470; 19 minutes) . 41 High Over the Border U.S. Coordinator of Inter-American Af- fairs, 1941. Migrations of humming birds, wild ducks and other birds between North and South America. Live photog- raphy and animated maps. (21 minutes) 32 High Plain U.S. Coordinator of Inter-American Af- fairs, 1943. How the landlord of a large agricultural estate on the high plains of Bolivia, whose family has owned the land for 300 years, controls the labor and lives of his 5,000 workers, descendants of the Aymara tribe who retain their primitive customs and modes of work and life. (20 minutes) 32, 41 High Spots of a High Country U.S. Coordinator of Inter-American Af- fairs, 1942. (Guatemala Sketch Book Series No. 1) General view of Guate- mala: scenery, volcanoes, markets, crafts, coffee plantations. (19 minutes, color) 32, 41 Higher and Faster U.S. Department of the Army, 1948. (Armed Forces Screen Reports Series No. 99) Rapid advancement in the con- struction of airplanes since Wright Broth- ers; role of airplanes in achieving victory in World Wars I and II. (AFSR 99; 19 minutes) 41 Highline: The Columbia River Power System U.S. Bonneville Power Administration, 1950. Construction and operation of Fed- eral transmission network of Bonneville Power administration for marketing hydro-electric power from Bonneville and Grand Coulee Dams; integration of vari- ous plants in system. (20 minutes) 16, 33 Highway Soil Engineering U.S. Bureau of Public Roads, 1949. How to survey and sample in the field and test in the laboratory subgrade soils found in highway construction. Tests used by Bureau of Public Roads' Physical Re-