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Society for Applied Spectroscopy‎(1973)‎

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By Pipas Michael J.   Witmer Gary W.   in Western Journal of Applied Forestry

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By Stewart William B.   Witmer Gary W.   Koehler Gary M.   in Western Journal of Applied Forestry

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Society of American Foresters‎(1999)‎

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By Witmer Gary W.   Snow Nathan P.   Moulton Rachael S.   Swartz Jenna L.   in Canadian Journal of Forest Research

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NRC Research Press‎(2012)‎

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