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1 Ellis, J.D., Evans, J.D., Pettis, J. 2010. Colony losses, managed colony population decline, and Colony Collapse Disorder in the United States. Journal of Apicultural Research, 49(1): 134-136.
2 High Levels of Miticides and Agrochemicals in North American Apiaries: Implications for Honey Bee Health, Christopher A. Mullin et al.
3 Crop pollination from native bees at risk from agricultural intensification, Claire Kremen et al, PNAS 16812-16816 , December 24, 2002.
4 Native bees provide insurance against ongoing honey bee losses, Rachel Winfree et al, Ecology Letters, (2007) 10: 1105-1113.
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