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  1. A monograph of the fresh-water univalve mollusca of the United States / by George W. Tryon.
    By: Tryon, George W. - Haldeman, Samuel Stehman,
    Publication info: Philadelphia :Conchological Section of the Academy of Natural Sciences,1870?
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Institution Libraries
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