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  1. The corn leaf-aphis and corn root-aphis / F. M. Webster.
    By: Webster, F. M. - United States.
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture, Bureau of Entomology,1907.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Agricultural pests  Aphids  Aphis  Corn  Corn root-aphis  Diseases and pests  
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  2. The corn root-aphis /
    By: Flint, W. P. - Illinois.
    Publication info: Urbana, Ill. :Illinois Natural History Survey,1919.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Corn  Corn root-aphis  Diseases and pests  
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