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  1. First records, noteworthy observations and new distributional data for birds in Paraguay
    By: Capper, David R - Clay, Robert P - N , Alberto Madrono - Barnett, Juan Mazar - Burfield, Ian J - Esquivel, Estela Z - Kennedy, Corinne P - Perrens, Mirna - Pople, Robert G
    Type: Article
    In: Bulletin of The British Ornithologists' Club
    Volume: 121
    Date: 2001
    Page Range: 23--37
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  2. New and noteworthy observations on the Paraguayan avifauna
    By: Lowen, James C - Clay, Robert P - Barnett, Juan Mazar - Pearman, Mark - Lanus, Bernabe Lopez - Tobias, Joe A - Liley, Durwyn C - Brooks, Thomas M - Esquivel, Estela Z - Reid, Jane M
    Type: Article
    In: Bulletin of The British Ornithologists' Club
    Volume: 117
    Date: 1997
    Page Range: 275--293
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  3. Noteworthy records and range extensions of some birds from the Reserva Natural del Bosque Mbaracayu (Mbaracayu Forest Nature Reserve), Departamento de Canindeyu, Paraguay
    By: Esquivel, Estela Z
    Type: Article
    In: Bulletin of The British Ornithologists' Club
    Volume: 117
    Date: 1997
    Page Range: 166--176
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