JS1456: Acoustic Test Analysis and Results for the Soloy Gemini and Twin Ranger Helicopters, 1993-04-29, Box: 17, Folder: 9. Shannon Engineering, Inc., records, 8746. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/archival_objects/766979 Accessed June 14, 2026.