United States. Bureau of Labor Statistics. Techniques of Preparing Major BLS Statistical Series : From the Monthly Labor Review of the Bureau of Labor Statistics, September, October, and November 1949, and January, February, March, and April 1950 Issues : Bulletin of the United States Bureau of Labor Statistics, No. 993 , Washington, D.C: G.P.O., 1950, https://fraser.stlouisfed.org/title/4388, accessed on January 5, 2026.