Invention Release—Matthews, Box: 88, Folder: F211. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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Invention Release—Matthews, Box: 88, Folder: F211. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/91076 Accessed September 07, 2024.