By Nelson Cara R   Halpern Charles B   in Canadian Journal of Botony

ISSN:1480-3305|83|6|610-620

NRC Research Press‎(2005)‎

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By Sutherland Steve   Nelson Cara R.   in Western Journal of Applied Forestry

ISSN:0885-6095|25|1|27-33

Society of American Foresters‎(2010)‎

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