NASA / NSF Interest in SES, Box: 55, Folder: F25. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections.
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NASA / NSF Interest in SES, Box: 55, Folder: F25. Karl Wolfgang Böer papers, MSS 0483. University of Delaware Library Special Collections. https://findingaids.lib.udel.edu/repositories/2/archival_objects/90204 Accessed July 26, 2024.