Affiliation: | aInternational Secretariat, Swedish Energy Agency, Box 310, SE-631 04 Eskilstuna, Sweden bSkogsvårdsstyrelsen Värmland Örebro/Regional Forestry Board, Skogsenheten/Forest Department, P.O. Box 387, S-651 09 Karlstad, Sweden cForest Economics Service, Forestry Department, Food and Agriculture Organization of UN, Viale delle Terme di Caracalla, 00100 Rome, Italy |