United States. Department of the Treasury. "Public Debt To End Walk-In Service For Treasury Securities, May 3, 1999," in United States. Department of the Treasury. "Volume 376," Press Releases of the United States Department of the Treasury (May 3, 1999 - June 30, 1999) : 13-15. https://fraser.stlouisfed.org/title/6111/item/587219/toc/573272 , accessed on May 18, 2024.