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80 U. S. GOVERNMENT FILMS needed to use standard combine; seed cleaning methods. (10 minutes, color) 4, 32, 41 Harvests for Tomorrow U.S. Department of Agriculture, 1941. New England's basic soil conservation need; sound pasture improvement pro- gram; soil building practices used in Northeast States. (27 minutes) 32, 41 Hatch Canopy. Part 1: Measuring and Drawing U.S. Department of the Navy, 1944. (Shipbuilding Skills Series. Sailmaking) Title self-explanatory. Supplementary film- strip, same title, also available. (MN 2343-b; 21 minutes) 41 Hatch Canopy. Part 2: Layout U.S. Department of the Navy, 1944. (Shipbuilding Skills Series. Sailmaking) Title self-explanatory. Supplementary film- strip, same title, also available. (MN 2343-c; 25 minutes) 41 Hatch Canopy. Part 3: Machining and Finishing-Off U.S. Department of the Navy, 1944. (Shipbuilding Skills Series. Sailmaking) Title self-explanatory. Supplementary film- strip, same title, also available. (MN 2343-d; 21 minutes) 41 Haunts for the Hunted U.S. Fish and Wildlife Service, 1941. How to maintain suitable wildlife habitat on National Wildlife Refuges; views of many species of ducks, geese, rare trum- peter swan, and whooping cranes. (30 minutes, color, silent) 20 Hay Is What You Make It U.S. Department of Agriculture, 1946. Hay quality improvement by cutting at right stage of growth; curing; retaining leaves for proteins. (18 minutes, color) 32, 41 Hay que Alimenlar la Tierra U.S. Institute of Inter-American Affairs, 1947. Spanish version of "The Land Must Eat." Portuguese version "Como Cuidar Da Terra" also available. (9 min- utes, color) 37 Head Injury U.S. Department of the Navy, 1945. (Medicine in Action Series No. 8. Report of a Battle Casualty) How one kind of head injury was treated; cranial oper- ation from beginning to end; surgical and medical techniques. Special film for medical personnel. (MN 3726-h; 10 min- utes, color) 41 Health Education Against Malaria U.S. Public Health Service, 1947. (Mal- aria Control Series) Sumter, S. C., teacher provides hometown with essential malaria control and mosquito elimination data after health education course at Mem- phis, Tenn., sponsored by local, state, and Federal public health officials. (CDC- 4-010; 6 minutes) 27 Heart of the Inca Empire U.S. Coordinator of Inter-American Af- fairs, 1943. Study of the ruins of the famous Inca city of Machu Picchu near Cuzco, Peru. (19 minutes, color) 32, 41 Heat and Its Control U.S. Bureau of Mines in cooperation with Johns-Manville Corp., 1942. History of heat: sun worship, James Watt's research. Three heat transfer methods in steam boiler: radiation, convection, conduction. Manufacture and use of insulation: mag- nesia, rock-wool, asbestos, celite. (20 min- utes) 17 Heat Exhaustion, Sunstroke and Burns U.S. Department of the Navy, 1947. (Personnel Damage Control Series) How to recognize and treat heat stroke and exhaustion, and 1st, 2nd, and 3rd degree