17 h 28 m, 19 agos 1955 año - Courses to train teachers to use film were run by universities and teacher training colleges, and five separate national professional organisations for visual instruction had been established by 1930 (Saettler 1990). Selwyn, Neil. Education and Technology: Key Issues and Debates (p. 51). Bloomsbury Publishing. Kindle Edition.
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17 h 28 m, 19 agos 1955 año
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