U.S. 4,259,409 (Arnold), Box: 88, Folder: F182. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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U.S. 4,259,409 (Arnold), Box: 88, Folder: F182. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/91045 Accessed September 07, 2024.