Olenin, Alice , Talbert, Lewis Emerson and United States. Bureau of Labor Statistics. Revised Indexes of Factory Employment and Pay Rolls, 1919 to 1933 : Bulletin of the United States Bureau of Labor Statistics, No. 610 , Washington, D.C: U.S. G.P.O., February 1935, https://fraser.stlouisfed.org/title/4132, accessed on August 7, 2024.