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  1. By: Webster, F. M. (Francis Marion), - United States. Bureau of Entomology. - United States. Department of Agriculture.
    Edition: Revision.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Bureau of Entomology, 1909
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Agricultural pests  Aphids  Diseases and pests  Grain  Greenbug  Toxoptera
  2. By: Webster, F. M. (Francis Marion), - United States. Bureau of Entomology. - United States. Department of Agriculture.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, Bureau of Entomology, 1907
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Agricultural pests  Aphids  Diseases and pests  Grain  Greenbug  Toxoptera