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  1. By: Duckworth, J W - Tizard, R. J. - Timmins, R. J. - Thewlis, Richard M. - Robichaud, W G - Evans, Tom D.
    Type: Article
    In: Forktail
    Volume: 13
    Date: 1998
    Page Range: 33--68
    Publication Info: Oxford,
  2. By: Best, Brinley J - Clarke, Christopher T - Checker, Matthew - Broom, Amanda L. - Thewlis, Richard M. - Duckworth, Will - Mcnab, Angus
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 113
    Date: 1993
    Page Range: 108--119
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Best, Brinley J - Clarke, Christopher T - Checker, Matthew - Broom, Amanda L. - Thewlis, Richard M. - Duckworth, Will - Mcnab, Angus
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 113
    Date: 1993
    Page Range: 234--255
    Publication Info: London, British Ornithologists' Club, 1893-
  4. By: Thewlis, Richard M. - Martins, R P
    Type: Article
    In: Forktail
    Volume: 16
    Date: 2000
    Page Range: 57--59
    Publication Info: Oxford,
  5. By: Evans, Tom D. - Towll, H. C. - Timmins, R. J. - Thewlis, Richard M. - Stones, A J - Robichaud, W G - Barzen, J.
    Type: Article
    In: Forktail
    Volume: 16
    Date: 2000
    Page Range: 29--52
    Publication Info: Oxford,