United States. Department of the Treasury. "Estimated Amount of Wholy Tax Exempt Securities Outstanding, March 31, 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) : 97-98. https://fraser.stlouisfed.org/title/6111/item/586840/toc/558535 , accessed on May 19, 2024.