By McInnis Bryce G.   Roberts Mark R.   in Northern Journal of Applied Forestry

ISSN:0742-6348|11|4|131-137

Society of American Foresters‎(1994)‎

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By Roberts Mark R   in Canadian Journal of Botony

ISSN:1480-3305|82|9|1273-1283

NRC Research Press‎(2004)‎

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