United States. Bureau of Labor Statistics.
Manpower Planning for Technological Change: Case Studies of Telephone Operators : Bulletin of the United States Bureau of Labor Statistics, No. 1574 ,
Washington, D.C.]:
U.S. Dept. of Labor Bureau of Labor Statistics,
May 1967, https://fraser.stlouisfed.org/title/4940,
accessed on March 22, 2025.
@FedFRASER