By Sundahl William E.   in Journal of Forestry

ISSN:0022-1201|69|11|790-792

Society of American Foresters‎(1971)‎

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By Powers Robert F.   Sundahl William E.   in Journal of Forestry

ISSN:0022-1201|71|6|338-339

Society of American Foresters‎(1973)‎

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