JS1344: Dee Howard Company TR4000 Thrust Reverser on Learjet 31 Thrust Substantiation and Related, 1988-09-15, Box: 14, Folder: 26. Shannon Engineering, Inc., records, 8746. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/archival_objects/766876 Accessed June 14, 2026.