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  1. By: Lawson, Walter J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 83
    Date: 1963
    Page Range: 4--7
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Lawson, Walter J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 82
    Date: 1962
    Page Range: 133--134
    Publication Info: London, British Ornithologists' Club, 1893-
  3. By: Lawson, Walter J
    Type: Article
    In: Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn
    Volume: 38
    Date: 1987
    Page Range: 19--45
    Publication Info: Bonn, Das Forschungsinstitut,
  4. By: Lawson, Walter J
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 104
    Date: 1984
    Page Range: 144--146
    Publication Info: London, British Ornithologists' Club, 1893-