Poll on Methods and Equipment, Box: 2, Folder: F71. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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Poll on Methods and Equipment, Box: 2, Folder: F71. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/87942 Accessed September 16, 2024.