Monthly design and development status reports for Air Force B-I Open-Loop Oxygen Generating System (OLOGS), April-December 1973, Box: 26, Folder: 5-6. Personal papers of Daryle H. Busch, PP 637. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/512034 Accessed March 13, 2025.