By Helvey J. David   Kochenderfer James N.   in Northern Journal of Applied Forestry

ISSN:0742-6348|5|2|123-127

Society of American Foresters‎(1988)‎

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By Helvey J. David   Kochenderfer James N.   in Northern Journal of Applied Forestry

ISSN:0742-6348|4|1|23-25

Society of American Foresters‎(1987)‎

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By Patric James H.   Evans James O.   Helvey J. David   in Journal of Forestry

ISSN:0022-1201|82|2|101-104

Society of American Foresters‎(1984)‎

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