By Johnson Paul S.   Weigel Dale R.   in Northern Journal of Applied Forestry

ISSN:0742-6348|7|2|79-81

Society of American Foresters‎(1990)‎

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By Weigel Dale R.   Parker George R.   in Northern Journal of Applied Forestry

ISSN:0742-6348|14|2|90-94

Society of American Foresters‎(1997)‎

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By Johnston Jerry J.   Weigel Dale R.   Randolph J. C.   in Journal of Forestry

ISSN:0022-1201|95|6|16-20

Society of American Foresters‎(1997)‎

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