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  1. By: Milton, Suzanne J - Siegfried, W Roy
    Type: Article
    In: Journal of South African Botany
    Volume: 47
    Issue: 4
    Date: 1981
    Page Range: 701--716
    Publication Info: Kirstenbosch National Botanic Gardens of South Africa
  2. By: Siegfried, W Roy
    Type: Article
    In: The Wilson bulletin
    Volume: 88
    Issue: 4
    Date: 1976
    Page Range: 566--574
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Siegfried, W Roy
    Type: Article
    In: The Canadian field-naturalist
    Volume: 86
    Issue: 1
    Date: 1972
    Page Range: 86--86
    Publication Info: Ottawa Ottawa Field-Naturalists' Club