International Business Machines, Box: 51, Folder: F91. J. Ben Lieberman papers, MSS 0516. University of Delaware Library Special Collections.
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International Business Machines, Box: 51, Folder: F91. J. Ben Lieberman papers, MSS 0516. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/86395 Accessed September 18, 2024.