Richards, W. R., 1961, North American Börnerina Bramstedt and Betulaphis Glendenning (Homoptera: Aphididae)

Richards, W. R., 1961, North American Börnerina Bramstedt and Betulaphis Glendenning (Homoptera: Aphididae), Canadian Entomologist 93, No. 6, pp. 486-494

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http://dx.doi.org/10.4039/Ent93486-6

link to original document

http://dx.doi.org/10.4039/Ent93486-6

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