JS1002.2: Substantiation Data for the R/S 421 FAA Flight Manual; Appendix A: Substantiation Data for the Commonwealth of Australia Department of Transportation for the Robertson STOL Cessna 421B Aerodynamic Performance, 1973-04-30 - 1975-05-30, Box: 2 , Folder: 7. Shannon Engineering, Inc., records, 8746. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/archival_objects/766514 Accessed June 14, 2026.