United States. Bureau of Labor Statistics. "Union Scales of Wages and Hours in the Building Trades in 70 Cities, May 15, 1937 : Bulletin of the United States Bureau of Labor Statistics, No. 657,"
Union Wages and Hours in the Building Trades
(April 1938).
https://fraser.stlouisfed.org/title/4200/item/494435, accessed on August 10, 2026.