United States. Bureau of Labor Statistics. "Union Wages, Hours, and Working Conditions in the Building Trades, June 1, 1939 : Bulletin of the United States Bureau of Labor Statistics, No. 674," Union Wages and Hours in the Building Trades (June 1, 1939). https://fraser.stlouisfed.org/title/4200/item/494437, accessed on April 21, 2025.
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