At head of title: United Nations Economic Commission for Europe, Food and Agriculture Organization of the United Nations, Timber Section, Geneva, Switzerland. "This study also has the following European Commission reference code: EUR 19904 EN". Paper compiled within the EUROLANDSCAPE Project at the Environment and GEOinformation Unit of the European Comission's Joint Research Centre in collaboration with the ECE/FAO TBFRA-2000 Team. Includes bibliographical references (p. 77-82). Available also at ECE Timber Committee website.