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ISSN:1521-0723|24|2|201-204

Routledge Ltd‎(2011)‎

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By Koehler Gary M.   Brittell J. David   in Journal of Forestry

ISSN:0022-1201|88|10|10-14

Society of American Foresters‎(1990)‎

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By Stewart William B.   Witmer Gary W.   Koehler Gary M.   in Western Journal of Applied Forestry

ISSN:0885-6095|14|3|128-131

Society of American Foresters‎(1999)‎

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