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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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