• [2013-01-29] Spring may come earlier to North American forests
  + https://blogs.princeton.edu/research/2013/01/29/spring-may-come-earlier-to-north-american-forests-geophysical-research-letters/ + http://onlinelibrary.wiley.com/doi/10.1029/2012GL054431/abstract
  in Tietoukka Monitor > 2013 > 2013-05 with forests north_america phenology temperate_zones trees

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