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weather.gc.ca
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"July 1937". Canadian Climate Data. Environment Canada. 31 October 2011. Retrieved 6 April 2016.
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"February 1936". Canadian Climate Data. Environment Canada. 31 October 2011. Retrieved 6 April 2016.
Salmers, G.C. (2006). "Estevan". Encyclopedia of Saskatchewan. Great Plains Research Center. Archived from the original on 24 November 2012. Retrieved 3 November 2010.