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  1. By: Sawyer, R. C. J.
    Type: Article
    In: The Avicultural magazine
    Volume: 107
    Issue: 1
    Date: 2001
    Page Range: 1--4
    Publication Info: Ascot, Berkshire, etc Avicultural Society, etc
  2. By: Sawyer, R. C. J.
    Type: Article
    In: The Avicultural magazine
    Volume: 107
    Issue: 3
    Date: 2001
    Page Range: 97--100
    Publication Info: Ascot, Berkshire, etc Avicultural Society, etc
  3. By: Sawyer, R. C. J.
    Type: Article
    In: The Avicultural magazine
    Volume: 108
    Issue: 3
    Date: 2002
    Page Range: 100--106
    Publication Info: Ascot, Berkshire, etc Avicultural Society, etc
  4. By: Sawyer, R. C. J.
    Type: Article
    In: The Avicultural magazine
    Volume: 103
    Issue: 2
    Date: 1997
    Page Range: 49--71
    Publication Info: Ascot, Berkshire, etc Avicultural Society, etc