By Vahle J. Robert   Patton David R.   in Journal of Forestry

ISSN:0022-1201|81|1|14-22

Society of American Foresters‎(1983)‎

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By Patton David R.   Vahle J. Robert   in Western Journal of Applied Forestry

ISSN:0885-6095|1|2|48-51

Society of American Foresters‎(1986)‎

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