MIL-S-8698 (AMENDMENT 1), MILITARY SPECIFICATION: STRUCTURAL DESIGN REQUIREMENTS, HELICOPTERS (ASG) (28 FEB 1958) [NO S/S DOCUMENT]
MIL-S-8698 (AMENDMENT 1), MILITARY SPECIFICATION: STRUCTURAL DESIGN REQUIREMENTS, HELICOPTERS (ASG) (28 FEB 1958) [NO S/S DOCUMENT].