United States. Bureau of Labor Statistics. "BLS Handbook of Methods: Volume I : Bulletin of the United States Bureau of Labor Statistics, No. 2134-1" in BLS Handbook of Methods : Bulletin of the United States Bureau of Labor Statistics, No. 2134 (December 1982). https://fraser.stlouisfed.org/title/5238/item/529769, accessed on March 20, 2025.
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