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National Tree Seed Centre, Petawawa National Forestry Institute. 1992. Wang, B.S.P.; Fogal, W.H.; Schooley, H.O.; Downie, B. Pages 95-99 in S. Magnussen, J. Lavereau, and T.J.B. Boyle, Editors. Maintaining biodiversity. Should we be concerned?, Proceedings: 23rd Meeting of the Canadian Tree Improvement Association (CTIA). August 19-23, 1991, Ottawa, Ontario. Forestry Canada, Petawawa National Forestry Institute, Ottawa. 5 p.