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  1. Check list of the Coleoptera of America, north of Mexico / by G. R. Crotch.
    By: Crotch, George Robert. - Austin, E. P.
    Publication info: Salem :Naturalists' Agency,1873.
    Contributed by: Smithsonian Libraries
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  2. Correspondence : Austin (E.P.) and Engelmann (George), 1863-1867.
    By: Austin, E. P.
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
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