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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Pratt, H D
    Type: Article
    In: Bulletin of the British Ornithologists' Club
    Volume: 99
    Date: 1979
    Page Range: 105--108
    Publication Info: London, British Ornithologists' Club, 1893-
  2. By: Pratt, H D - Pratt, G K
    Type: Article
    In: Proceedings of the Entomological Society of Washington
    Volume: 86
    Date: 1984
    Page Range: 249--265
    Publication Info: Washington, etc, Entomological Society of Washington,