Hald, Helen F. and United States. Bureau of Labor Statistics. Seasonal Adjustment Factors: Wholesale Price Index: Selected Series, 1948-61 : Bulletin of the United States Bureau of Labor Statistics, No. 1379 , Washington, D.C: G.P.O., September 1963, https://fraser.stlouisfed.org/title/4844, accessed on February 16, 2025.