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Dennis vanEngelsdorp; Diana Cox-Foster; Maryann Frazier; Nancy Ostiguy; Jerry Hayes (5 January 2006). "Colony Collapse Disorder Preliminary Report"(PDF). Mid-Atlantic Apiculture Research and Extension Consortium (MAAREC) – CCD Working Group. p. 22. Archived from the original(PDF) on 4 July 2008. Retrieved 2007-04-24.