By McCurdy Dwight R.   Echelberger Herbert   in Journal of Forestry

ISSN:0022-1201|66|2|124-127

Society of American Foresters‎(1968)‎

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By Echelberger Herbert E.   Leonard Raymond E.   Adler Steven P.   in Journal of Forestry

ISSN:0022-1201|81|2|90-105

Society of American Foresters‎(1983)‎

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