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  1. Monograph of the Isoetaceae / Norma E. Pfeiffer. --
    By: Pfeiffer, Norma Etta.
    Publication info: [s.l. :s.n.],1922.
    Contributed by: MBLWHOI Library
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  2. Monograph of the Isoetaceae.
    By: Pfeiffer, Norma Etta.
    Publication info: [n.p.]1922.
    Contributed by: Robarts - University of Toronto (archive.org)
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  1. Monograph of the Isoetaceae
    By: Pfeiffer, Norma Etta.
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 9
    Date: 1922
    Page Range: 79--233
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  2. A New Selaginella from Mexico
    By: Greenman, J M - Pfeiffer, Norma Etta.
    Type: Article
    In: Annals of the Missouri Botanical Garden
    Volume: 5
    Date: 1918
    Page Range: 205--210
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