"Paper for printing purposes (other than newsprint) and writing paper: production, main trends, production in each continent — Exports and imports: main exporting countries, comparison between exports and imports — Second work in a series of Unesco studies concerning the previous situation and the future demand for paper." (Jean-Marie Van Bol, Abdelfattah Fakhfakh: The use of mass media in the developing countries. Brussels: CIDESA, 1971 Nr. 1702, topic code 141)