30 nov 1923 año - Frank Freeman classified the existing educational films into the following four categories: “(1) the dramatic, either fictional or historical; (2) the anthropological or sociological, differing from the dramatic in that it is not primarily based on a narrative or story; (3) the industrial or commercial, which show the processes of modern industry and commerce; and (4) the scientific, which may be classified into subgroups corresponding to the individual sciences, such as earth science, nature study, etc.”
