Patent – U of D Patent Agreement, Box: 25, Folder: F27. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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Patent – U of D Patent Agreement, Box: 25, Folder: F27. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/89274 Accessed September 07, 2024.