Progress in Solar Energy, VOL 6 (part 2), Box: 42, Folder: F150. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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Progress in Solar Energy, VOL 6 (part 2), Box: 42, Folder: F150. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/89904 Accessed September 20, 2024.
