RTI-5—Matysik, Box: 89, Folder: F255. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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RTI-5—Matysik, Box: 89, Folder: F255. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/91121 Accessed July 27, 2024.