JS1432: Dee Howard Company TR4000 Thrust Reverser on a Learjet Model 31A Thrust Setting Substantiation, 1991-07-31, Box: 16, Folder: 26. Shannon Engineering, Inc., records, 8746. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/archival_objects/766958 Accessed June 15, 2026.