JS1448: Acoustic Test Analysis and Results for the Schweizer Model 269C Helicopter, 1992-11-04 - 1997-03-23, Box: 17, Folder: 1. Shannon Engineering, Inc., records, 8746. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/archival_objects/766971 Accessed June 14, 2026.