“To Be Done”—PN Junction 6E6, Box: 51, Folder: F379. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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“To Be Done”—PN Junction 6E6, Box: 51, Folder: F379. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/90130 Accessed September 12, 2024.
