Recent warming by latitude associated with increased length of ragweed pollen season in central North America.
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Proc Natl Acad Sci U S A. 2011 Mar 8;108(10):4248-51. doi: 10.1073/pnas.1014107108. Epub 2011 Feb 22.
Proc Natl Acad Sci U S A. 2011.
PMID: 21368130
Free PMC article.