Chart 1
Average annual snow cover extent from 1972 to 2010

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Description for chart 1
Average annual snow cover extent from 1972 to 2010
Source(s):  Time series compiled by the Climate Processes Section of the Climate Research Division, Environment Canada from National Oceanic and Atmospheric Administration (NOAA - USA) Climate Data Record (CDR) Northern Hemisphere weekly snow chart dataset maintained by Rutgers University (accessed September, 2011).
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