MSS 0098, F0168, Henry A. du Pont correspondence with David Heber Plank, Special Collections, University of Delaware Library, Newark, Delaware.
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MSS 0098, F0168, Henry A. du Pont correspondence with David Heber Plank, Special Collections, University of Delaware Library, Newark, Delaware. https://findingaids.lib.udel.edu/repositories/2/resources/787 Accessed September 07, 2024.