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  1. Correspondence : Roetter and Engelmann, 1874-1878.
    By: Roetter, Paulus,
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
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  2. Paulus Roetter sketchbook on pines and cactus,
    By: Roetter, Paulus, - Engelmann, George, - Mueller, Mrs. S.
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
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