By Heald Robert C.   Barrett Tara M.   in Western Journal of Applied Forestry

ISSN:0885-6095|14|2|65-72

Society of American Foresters‎(1999)‎

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By Morrison Michael L.   Heald Robert C.   Dahlsten Donald L.   in Western Journal of Applied Forestry

ISSN:0885-6095|5|1|28-30

Society of American Foresters‎(1990)‎

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By York Robert A   Heald Robert C   Battles John J   York Jennifer D   in Canadian Journal of Forest Research

ISSN:1208-6037|34|3|630-641

NRC Research Press‎(2004)‎

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