By Lindgren B. Staffan   McGregor Mark D.   Oakes Robert D.   Meyer Hubert E.   in Western Journal of Applied Forestry

ISSN:0885-6095|4|2|49-52

Society of American Foresters‎(1989)‎

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By McGregor Mark D.   Furniss Malcom M.   Oaks Robert D.   Gibson Kenneth E.   Meyer Hubert E.   in Journal of Forestry

ISSN:0022-1201|82|10|613-616

Society of American Foresters‎(1984)‎

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