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Principal sunflower bees of North America with emphasis on the southwestern United States
By Hurd P.D., LaBerge W.E., Linsley E.G.
Smiths. Contr. Zool. 310, 1980
Cite: 594792 with citation markup [cite:594792]
Full text (87MB)

Above link is defunct -
Here's a link to the PDF. Smithsonia Research Online

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