Leybold-Heraeus Proposal #2, Box: 76, Folder: F473. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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Leybold-Heraeus Proposal #2, Box: 76, Folder: F473. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/90813 Accessed September 10, 2024.
