MSS 0099, F0688, Untermeyer, Louis, letters to Harlan Umansky, Special Collections, University of Delaware Library, Newark, Delaware.
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MSS 0099, F0688, Untermeyer, Louis, letters to Harlan Umansky, Special Collections, University of Delaware Library, Newark, Delaware. https://findingaids.lib.udel.edu/repositories/2/resources/1239 Accessed June 13, 2024.