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  1. By: Heydon, Steven L
    Type: Article
    In: Journal of the New York Entomological Society
    Volume: 97
    Date: 1989
    Page Range: 192--217
    Publication Info: Lawrence, Kan Allen Press [etc.]
  2. By: Heydon, Steven L
    Type: Article
    In: Journal of the New York Entomological Society
    Volume: 97
    Date: 1989
    Page Range: 347--357
    Publication Info: Lawrence, Kan Allen Press [etc.]
  3. By: Heydon, Steven L
    Type: Article
    In: Journal of Hymenoptera research
    Volume: 4
    Date: 1995
    Page Range: 1--24
    Publication Info: Washington, D.C, International Society of Hymenopterists, [1992-
  4. By: Heydon, Steven L
    Type: Article
    In: Journal of Hymenoptera research
    Volume: 2
    Date: 1993
    Page Range: 107--116
    Publication Info: Washington, D.C, International Society of Hymenopterists, [1992-