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  1. By: Williams, (Paul Hugh)
    Type: Article
    In: Bulletin of the Natural History Museum. Entomology series
    Volume: 67
    Date: 1998
    Page Range: 79--152
    Publication Info: Andover, Intercept,
  2. By: Williams, (Paul Hugh)
    Type: Article
    In: Bulletin of the British Museum (Natural History) Entomology
    Volume: 60
    Date: 1991
    Page Range: 1--204
    Publication Info: London, The Museum, 1950-1977
  3. By: Sheffield, C S - Williams, (Paul Hugh)
    Type: Article
    In: Journal of the Entomological Society of Ontario
    Volume: 142
    Date: 2011
    Page Range: 53--56
    Publication Info: [Harrow, Ont.] Entomological Society of Ontario 2003-
  4. By: Sheffield, Cory - Heron, Jennifer M. - Williams, (Paul Hugh)
    Type: Article
    In: Journal of Hymenoptera research
    Volume: 98
    Date: 2025-10-8
    Page Range: 861--870
    Publication Info: Washington, D.C International Society of Hymenopterists