By Cregg Bert M.   in Forest Science

ISSN:0015-749X|38|1|61-67

Society of American Foresters‎(1992)‎

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By Nzokou Pascal   Cregg Bert M.   O'Donnell Jill   in Northern Journal of Applied Forestry

ISSN:0742-6348|25|1|52-54

Society of American Foresters‎(2008)‎

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