1970
DOI: 10.1126/science.170.3955.263-a
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“…Northern hardwoods are one of the major forest cover types in the northeastern United States, covering more than 6 million ha (Filip and Leak 1973, Kingsley 1985, Leak and others 1969. The important timber species and principal components of this forest type are sugar maple (Acer saccharum Marsh.…”
Section: Introductionmentioning
confidence: 99%
“…Northern hardwoods are one of the major forest cover types in the northeastern United States, covering more than 6 million ha (Filip and Leak 1973, Kingsley 1985, Leak and others 1969. The important timber species and principal components of this forest type are sugar maple (Acer saccharum Marsh.…”
Section: Introductionmentioning
confidence: 99%