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February 1, 2009

A Survey of Honey Bee Colony Losses in the U.S., Fall 2007 to Spring 2008, PLoS ONE, Dennis vanEngelsdorp, Jerry Hayes, Jr., Robyn M. Underwood and Jeffrey Pettis

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0004071

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