| Nível unidade física | Pulp and paper development in Africa and the Near East : technical papers submitted to the Conference on Pulp and Paper Development in Africa and the Near East, sponsored jointly by the United Nations Economic Commission for Africa and the Food and Agriculture Organization of the United Nations, and held in Cairo 8 to 18 march 1956. - Rome : FAO, 1968. - p. 1489-1495 |