United States. Bureau of Labor Statistics.
Compensation Expenditures and Payroll Hours: Air Transportation, 1964 : Bulletin of the United States Bureau of Labor Statistics, No. 1571 ,
Washington, D.C:
U.S. Dept. of Labor Bureau of Labor Statistics,
October 1967, https://fraser.stlouisfed.org/title/4678,
accessed on April 16, 2025.
@FedFRASER