"The author describes some slides produced by the FAO in the field of agricultural training — This material, intended for African countries and for other developing regions, is produced by FAO agricultural specialists in collaboration with the experts of the audio-visual section." (Jean-Marie Van Bol, Abdelfattah Fakhfakh: The use of mass media in the developing countries. Brussels: CIDESA, 1971 Nr. 310, topic code 522)