Sustainable production of wood and non-wood forest products : proceedings of the IUFRO Division 5 Research Groups 5.11 and 5.12, Rotorua, New Zealand, March 11-12, 2003 / - Donoghue, Ellen M.; Benson, Gary L.; Chamberlain, James L. (U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station,, 2004)