Analysis of information sources in references of the Wikipedia article "Tree line" in English language version.
Tree line, the elevation above which trees do not grow, is about 4,400 feet in the White Mountains, nearly 2,000 feet below the summit of Mt. Washington.
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: CS1 maint: numeric names: authors list (link)Tree line, the elevation above which trees do not grow, is about 4,400 feet in the White Mountains, nearly 2,000 feet below the summit of Mt. Washington.