United States. Bureau of Labor Statistics. "Handbook of Labor Statistics, 1941 edition : Volume I: All Topics ExceptWages : Bulletin of the United States Bureau of Labor Statistics, No. 694,"
Handbook of Labor Statistics
(1941).
https://fraser.stlouisfed.org/title/4025/item/494372/content/pdf/bls_0694_1942pt1, accessed on September 5, 2026.