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Bumble Bees of the Eastern United States
By Sheila Colla, Leif Richardson, Paul Williams
USDA, 2011
Cite: 595902
Downloadable PDF at:
http://www.fs.fed.us/wildflowers/pollinators/documents/BumbleBeeGuide2011.pdf
(Link broken as of November 2012--see Mike Quinn's separate link below for another source.)

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Bumble Bees of the Eastern United States
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Full PDF

Citation:
Colla, S.R., L. Richardson, and P. Williams. 2011. Bumblebees of the Eastern United States. FS-972. USDA Forest Service and the Pollinator Partnership. 103 pp.
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Guide to Bumble Bees of the Eastern United States
This is a great reference!

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