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100 U. S. GOVERNMENT FILMS Know Your Land U.S. Department of Agriculture, 1945. Principle of land classification: charac- teristics, use, and treatment of eight classes of land. Filmstrip, same title, also available. (13 minutes, color) 4, 32, 41 Know Your Typewriter U.S. Federal Security Agency, 1941. Tricks and short cuts in caring for and operating a typewriter; how to cut main- tenance costs and assure greater efficiency. (30 minutes, color, also b&w) 32, 36 Korea Today U.S. Department of the Army, 1948. Present-day (1948) occupation in Korea with special emphasis on rehabilitation progress made by the Americans. (AFSR 94; 19 minutes) 41 Korea's New Army; Operation Vittles (Berlin Airlift) U.S. Department of the Army, 1949. How Korean soldiers are being trained in modern warfare: weapons, communi- cations, machines, aerial observation and nursing. How U.S. transport planes took tons of food, fuel, and supplies to block- aded Berlin. Includes "Operation Vittles" released by U.S. Department of the Air Force. (AFSR 103; 21 minutes) 41 La Paz U.S. Coordinator of Inter-American Af- fairs, 1943. A film journey through La Paz, Bolivia's capital and the "highest big city in the world." Contrasts the old and the new in Latin America. (17 min- utes) 32, 41 Laboratory Diagnosis of Diphtheria. Part 1: Microscopic Study and Isola- tion of C. Diphtheriae U.S. Public Health Service, 1950. Pro- cedures for isolating pure cultures of C. diphtheriae from throat and nasal swabs of a patient with suspected diph- theria. Photomicrographs of organisms and live action photography. (CDC-4- 088; 13 minutes) 27, 41 Laboratory Diagnosis of Diphtheria. Part 2: Determination of Types of C. Diphtheriae U.S. Public Health Service, 1950. Pro- cedures to determine cultural types of C. diphtheriae, hemolysin and fermenta- tion tests and observation of colony forms. Bacteriology Laboratory film. (CDC-4-088.2; 11 minutes) 27, 41 Laboratory Diagnosis of Diphtheria. Part 3: Animal Inoculation U.S. Public Health Service, 1950. Lab- oratory procedures for preparing pure broth cultures of C. diphtheriae for in- jection into rabbits, guinea pigs, and chicks to determine virulence. Live action photography. (CDC-4-008.1; 13 minutes) 27, 41 Laboratory Diagnosis of Diphtheria. Part 4: the In Vitro Test for Viru- lence of C. Diphtheriae U.S. Public Health Service, 1950. Prin- ciples and procedures of In Vitro test for virulence of C. diphtheriae with off stage narration and live action photog- raphy showing techniques from operator's viewpoint. (CDC-4-106; 12 minutes) 27, 41 The Laboratory Diagnosis of Influ- enza U.S. Public Health Service, 1950. Intro amniotic inoculation of chick embryos with virus recovered from nose and throat washings; identification of hema- glutination inhibition tests with specific immune area; antibody response. For laboratory technicians. (CDC-4-101; 15 minutes) 27, 41 Laboratory Diagnosis of Rabies U.S. Public Health Service, 1950. Tech- niques of diagnosis essential to doctor prior to human treatment: removal of brain from body; smear; photomicro-