By Linnartz Norwin E.   Hse Chung-Yun   Duvall V. L.   in Journal of Forestry

ISSN:0022-1201|64|4|239-243

Society of American Foresters‎(1966)‎

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By Pearson H. A.   Whitaker L. B.   Duvall V. L.   in Journal of Forestry

ISSN:0022-1201|69|10|744-746

Society of American Foresters‎(1971)‎

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