United States. Department of the Treasury. "Statistics of Income 1934 Supplement, August 1, 1938," in United States. Department of the Treasury. "Volume 24," Press Releases of the United States Department of the Treasury (July 15, 1938 - October 17, 1938) : 70-74. https://fraser.stlouisfed.org/title/6111/item/586865/toc/567309 , accessed on April 19, 2024.