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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Helfer, J R
    Type: Article
    In: Bulletin of the Brooklyn Entomological Society
    Volume: 41
    Series: new
    Date: 1946
    Page Range: 105--109
    Publication Info: Brooklyn, N.Y, The Society,
  2. By: Helfer, J R
    Type: Article
    In: The Pan-Pacific entomologist
    Volume: 22
    Date: 1946
    Page Range: 100--102
    Publication Info: San Francisco, Pacific Coast Entomological Society,
  3. By: Helfer, J R
    Type: Article
    In: The Pan-Pacific entomologist
    Volume: 28
    Date: 1952
    Page Range: 188--191
    Publication Info: San Francisco, Pacific Coast Entomological Society,
  4. By: Helfer, J R
    Type: Article
    In: Bulletin of the Brooklyn Entomological Society
    Volume: 42
    Series: new
    Date: 1948
    Page Range: 140--141
    Publication Info: Brooklyn, N.Y, The Society,
  5. By: Helfer, J R
    Type: Article
    In: The Pan-Pacific entomologist
    Volume: 29
    Date: 1953
    Page Range: 34--36
    Publication Info: San Francisco, Pacific Coast Entomological Society,