United States. Department of the Treasury. "Large denominations of currency to be discontinued, July 14, 1969," in United States. Department of the Treasury. "Volume 165," Press Releases of the United States Department of the Treasury (May 6, 1969 - August 29, 1969) : 290-292. https://fraser.stlouisfed.org/title/6111/item/587008/toc/541492 , accessed on June 22, 2024.