United States. Department of the Treasury. "Estimated Amount of Wholly Tax Exempt Securities Outstanding, June 4, 1924," in United States. Department of the Treasury. "Volume 3A," Press Releases of the United States Department of the Treasury (January 5, 1924 - December 7, 1925) : 116-117. https://fraser.stlouisfed.org/title/6111/item/586840/toc/558539 , accessed on May 20, 2024.