By Vaux Henry J.   May Richard H.   in Journal of Forestry

ISSN:0022-1201|47|4|260-264

Society of American Foresters‎(1949)‎

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By May Richard H.   Hartong Allan L.   in Journal of Forestry

ISSN:0022-1201|57|10|724-728

Society of American Foresters‎(1959)‎

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