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  1. By: Williams, S A
    Type: Article
    In: Revue suisse de zoologie
    Volume: 85
    Date: 1978
    Page Range: 167--176
    Publication Info: Genève, Kundig [etc.],
  2. By: Williams, S A
    Type: Article
    In: Revue suisse de zoologie
    Volume: 84
    Date: 1977
    Page Range: 815--816
    Publication Info: Genève, Kundig [etc.],
  3. By: Williams, S A
    Type: Article
    In: Rhodora
    Volume: 96
    Date: 1994
    Page Range: 30--43
    Publication Info: [Cambridge, Mass., etc.], New England Botanical Club [etc.],
  4. By: Williams, S A
    Type: Article
    In: British journal of entomology and natural history
    Volume: 3
    Date: 1990
    Page Range: 114--114
    Publication Info: [London], British Entomological and Natural History Society, 1988-