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1 Title by Shafer, John Adolph, (1863 - 1918) 

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  1. A preliminary list of the vascular flora of Allegheny County, Pennsylvania / by John A. Shaffer.
    By: Shafer, John Adolph,
    Publication info: Pittsburgh? :Carnegie Institute Museum?,1901?
    Contributed by: Mertz Library, The New York Botanical Garden
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