JS1315: Master Drawing List for Sikorsky S-61N Helicopters Equipped for 11,000 Pound Class B External Load, 1988-08-30, Box: 13, Folder: 17. Shannon Engineering, Inc., records, 8746. Division of Rare and Manuscript Collections. https://aspace3-test.library.cornell.edu/repositories/2/archival_objects/766844 Accessed June 16, 2026.