Original Copies—CdS Cu2S 6E6, Box: 50, Folder: F346. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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Original Copies—CdS Cu2S 6E6, Box: 50, Folder: F346. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/90096 Accessed July 26, 2024.
