By Griffiths Jeff   Graham Jeff   in Proceedings of the Water Environment Federation

ISSN:1938-6478|2011|5|158-167

Water Environment Federation‎(2011)‎

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By Graham Jeff S.   in Northern Journal of Applied Forestry

ISSN:0742-6348|15|3|113-115

Society of American Foresters‎(1998)‎

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