Wilkie, T. (2014). Having gone from 110 to 127 countries this year, the great backyard bird count is a growing example of self-propelled 'citizen science'. Edmonton Examiner.
http://www.edmontonexaminer.com/2014/02/27/having-gone-from-110-to-127-countries-this-year-the-great-backyard-bird-count-is-a-growing-example-of-self-propelled-citizen-science
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