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Bumble Bees of the Eastern United States
By Sheila Colla, Leif Richardson, Paul Williams
USDA, 2011
Cite: 595902 with citation markup [cite:595902]

Link appears to be up again:
Link appears to be up again:

http://www.fs.fed.us/wildflowers/pollinators/documents/BumbleBeeGuideEast2011.pdf

I think they changed the filename to add East when the Western edition was published in 2012.

PDF link not working
The file may have been moved.

Bumble Bees of the Eastern United States
.
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.
.

Guide to Bumble Bees of the Eastern United States
This is a great reference!

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