By Conover D. F.   Ralston R. A.   in Journal of Forestry

ISSN:0022-1201|57|8|551-557

Society of American Foresters‎(1959)‎

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By Rudolf Paul O.   Ralston R. A.   in Journal of Forestry

ISSN:0022-1201|51|2|121-124

Society of American Foresters‎(1953)‎

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