By Hornick John R.   Zerbe John I.   Whitmore Jacob L.   in Journal of Forestry

ISSN:0022-1201|82|11|663-667

Society of American Foresters‎(1984)‎

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By Christophersen Kjell A.   Wahlgren Harold E.   Whitmore Jacob L.   Zerbe John I.   Laundrie James F.   in Journal of Forestry

ISSN:0022-1201|80|4|235-254

Society of American Foresters‎(1982)‎

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