By Elliott B.   Oty K.   McArthur J.   Clark B.   in International Journal of Mathematical Education in Science and Technology

ISSN:1464-5211|32|6|811-816

Taylor & Francis Ltd‎(2001)‎

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By Young J. A.   McArthur J. A. B.   Hedrick D. W.   in Journal of Forestry

ISSN:0022-1201|65|6|391-393

Society of American Foresters‎(1967)‎

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