This report covers the work of forest resources mapping undertaken by the Remote Sensing Unit of the Forestry Development Authority of Liberia between March 1982 and June 1984. Its principle aim is to reassess the actual forest cover area of Liberia by interpretation of recent aerial photography and the subsequent transfer of this photo detail to 1 in 125,000 map series. The procedures adopted for this mapping study are detailed.

El principal articulo de este nmero de Unasylva, que es del Profesor Gene Namkoong, se basa en la ponencia que present a los debates sobre recursos genticos en el Noveno Congreso Forestal Mundial, celebrado en Mxico, D.F., en julio de 1985. Considerando problemas de naturaleza tanto tcnica como tica, el Dr. Namkoong esboza varias estrategias alternativas para la ordenacin de los recursos genticos de las plantas leosas y examina su aplicacin a una serie de condiciones socioeconmicas, niveles de tecnologa y objetivos biolgicos.