By Strauss Charles H.   Lord Roger G.   in Northern Journal of Applied Forestry

ISSN:0742-6348|6|3|133-137

Society of American Foresters‎(1989)‎

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By Strauss Charles H.   McWilliams William H.   in Northern Journal of Applied Forestry

ISSN:0742-6348|4|3|119-124

Society of American Foresters‎(1987)‎

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