By Goheen Donald J.   Tkacz Borys M.   in Western Journal of Applied Forestry

ISSN:0885-6095|8|3|77-80

Society of American Foresters‎(1993)‎

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By Tkacz Borys M.   Hansen Everett M.   in Journal of Forestry

ISSN:0022-1201|80|12|788-791

Society of American Foresters‎(1982)‎

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