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Genus Aphalara
Biological Notes and New Records of North American Chermidae (Homoptera) By Klyver, F.D. Entomological News 43, 1932
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Biosystematics of hackberry psyllids (Pachypsylla) and the evolution of gall and lerp formation in psyllids By Yang, M.-M. & C. Mitter The Ecology and Evolution of Gall-forming Insects. United States Dept. of Agriculture, 1993
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The Nearctic Psylloidea (Insecta: Homoptera): an annotated check list By Hodkinson, I.D. Journal of Natural History, 22 (1179-1243), 1988
[cite:1177162]
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The psyllids (Homoptera-Psyllidae) of Alaska By Hodkinson I.D. Systematic Entomology 3: 333-360, 1978
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Psyllidae found at Ames, Iowa. By Mally C.W. Proceedings of the Iowa Academy of Sciences 2:152-171., 1894
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A revised classification of the jumping plant-lice (Hemiptera: Psylloidea) By Burckhardt D. & Ouvrard D. Zootaxa 3509: 1-34., 2012
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Two new species of Calophya and notes on others (Psyllidae: Homoptera) By Tuthill, L.D. Entomological News 53: 215-218., 1942
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Notes on North American Psyllidae. By Schwarz, E. A. Proceedings of the Entomological Society of Washington 6: 234-245, 1904
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