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254 U.S. GOVERNMENT FILMS How to Remove and Reinstall Radio Equipment LM-RU-GF-DU U.S. Department of the Navy, 1942. Re- moval and installation of LM-RU-GF-DU radio equipment. (SN 656; 46 frames) 41 How's Your Interviewing Technique U.S. Bureau of the Census, 1949. How to interview for the Census Bureau: good technique; how to approach the respondent; gain cooperation; handle problem situations. (51 frames, synchro- nized microgroove disc, 12 minutes; also script) 5 The Hydraulic Brake System U.S. Office of Education, 1945. (Auto- motive Operation and Maintenance Series. Preventive Maintenance No. 7) Reviews material presented in motion picture, same title. (OE 483; 35 frames) 41 Hydraulic Mechanisms U.S. Department of the Navy, 1942. Principle of hydraulic system; three types of pumps; and pressure control type of relief valve used in hydraulic systems and their operation. (SN 111; 50 frames) 7 Hydraulic Struts U.S. Department of the Navy, 1943. Need, use and functions of hydraulic struts; operating principles of hydraulic mechanism; construction and operation of hydraulic shock absorber; hydraulic strut; coiled-spring type strut; combina- tion pneumatic and hydraulic strut. (SN 2792; 37 frames) Hydrotherapy U.S. Office of Education, 1945. (Nursing Series) Reviews material presented in motion picture, same title. (OE 410; 55 frames) 41 Identification of Female Anophelines of the United States U.S. Public Health Service, 1946. (Ento- mology Series) Distinguishing characters for identifying 13 species of anophelines. Review and test sections. Titles, draw- ings and maps. (CDC-5-019; 73 frames, color, synchronized disc, 21 minutes) 27 Identification of Malaria Parasites in Thick Blood Films U.S. Public Health Service, 1948. (Ma- laria Control Series) Differential diag- nosis of species and forms of human malaria parasites observed in thick blood preparations from peripheral blood. Pho- tographs and photomicrographs. (CDC- 5-052; 50 frames, color, synchronized disc, 7 minutes) 27 Identification of Malaria Parasites in Thin Blood Films U.S. Public Health Service, 1947. (Ma- laria Control Series) How to classify de- velopmental stages and species of ma- laria parasites for adequate treatment. Four developmental stages: trophozoites; schizonts; mature schizonts; and gameto- phytes. Identifying characteristics of vivax, malariae, and falciparum. Photo- graphs, drawings and charts. (CDC-5- 051; 77 frames, color, synchronized disc, 17 minutes) 27 Identification of Some Common Sucking Lice U.S. Public Health Service, 1948. (Ty- phus Control Series) Distinction be- tween Anoplura and Mallophaga, suck- ing and biting lice; primary morphologi- cal characters identifying sucking lice adults and nymphs; and, their life history and medical significance. Drawings. (CDC-5-097; 60 frames, synchronized disc, 9 minutes) 27 Identification of South Pacific Plants U.S. Department of the Navy, 1944. (Cast- away Series) How to recognize tropical fruits, plants, and trees; use foliage, fruits or nuts, raw or cooked. (SN 2306-d; 90 frames, color, synchronized disc, 12 minutes) . 41