New X-Ray Diffraction-Fluorescence Method, Box: 90, Folder: F303. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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New X-Ray Diffraction-Fluorescence Method, Box: 90, Folder: F303. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/91172 Accessed July 26, 2024.
