Fraser, Andrew
and United States. Bureau of Labor Statistics.
Employment and Earnings in the Engineering Profession, 1929 to 1934 : Bulletin of the United States Bureau of Labor Statistics, No. 682 ,
Washington, D.C:
U.S. G.P.O.,
1941, https://fraser.stlouisfed.org/title/4182,
accessed on December 2, 2024.