By Day M. W.   Bey C. F.   Rudolph V. J.   in Journal of Forestry

ISSN:0022-1201|58|3|198-202

Society of American Foresters‎(1960)‎

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By Rudolph V. J.   Lemmien W.   Day M. W.   Arnold C. I.   Baum M.   in Journal of Forestry

ISSN:0022-1201|55|12|887-889

Society of American Foresters‎(1957)‎

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