“Optical Filler of Variable Density”, Box: 50, Folder: F340. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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“Optical Filler of Variable Density”, Box: 50, Folder: F340. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/90090 Accessed September 20, 2024.