JS1495: A Proposal to Increase the Category B Operational Altitudes of the Columbia Helicopters Boeing 234 Helicopter, 2002-06-24, Box: 18, Folder: 13. Shannon Engineering, Inc., records, 8746. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/archival_objects/767015 Accessed June 14, 2026.