1. U.S. Department of Agriculture, Forest Service, Southern Research Station, P.O. Box 12254, Research Triangle Park, NC 27709, U.S.A.
2. U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 620 SW Main Street, Suite 502, Portland, OR 97205, U.S.A.
3. Mpingo Conservation and Development Initiative, P.O. Box 49, Kilwa Masoko, Tanzania