By Swanston D. N.   Dyrness C. T.   in Journal of Forestry

ISSN:0022-1201|71|5|264-269

Society of American Foresters‎(1973)‎

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By Patric J. H.   Swanston D. N.   in Journal of Forestry

ISSN:0022-1201|66|1|62-66

Society of American Foresters‎(1968)‎

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