Analysis of information sources in references of the Wikipedia article "Tree line" in English language version.
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{{cite journal}}: Cite uses deprecated parameter |citeseerx= (help){{cite journal}}: Cite uses deprecated parameter |citeseerx= (help)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.
{{cite journal}}: Cite uses deprecated parameter |citeseerx= (help){{cite journal}}: Cite uses deprecated parameter |citeseerx= (help){{cite journal}}: Cite uses deprecated parameter |citeseerx= (help)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.