United States. Department of the Treasury. "Retroactive Rate Changes, August 4, 1993," in United States. Department of the Treasury. "Volume 325," Press Releases of the United States Department of the Treasury (July 30, 1993 - September 21, 1993) : 71-73. https://fraser.stlouisfed.org/title/6111/item/587168/toc/547449 , accessed on May 18, 2024.