Decline of bumble bees (Bombus) in the North American Midwest

@article{Grixti2009DeclineOB,
  title={Decline of bumble bees (Bombus) in the North American Midwest},
  author={Jennifer C. Grixti and Lisa T. Wong and Sydney Anne Cameron and Colin Favret},
  journal={Biological Conservation},
  year={2009},
  volume={142},
  pages={75-84}
}

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