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  1. New records of neotropical Gentianaceae
    By: Ewan, J
    Type: Article
    In: Proceedings of The Biological Society of Washington
    Volume: 63
    Date: 1950
    Page Range: 163--165
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  2. New records of neotropical Gentianaceae~III
    By: Ewan, J
    Type: Article
    In: Proceedings of The Biological Society of Washington
    Volume: 65
    Date: 1952
    Page Range: 189--192
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  3. New records of neotropical Gentianaceae-II
    By: Ewan, J
    Type: Article
    In: Proceedings of The Biological Society of Washington
    Volume: 64
    Date: 1951
    Page Range: 131--134
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