United States. Department of the Treasury. "Bill tender on monthly bills (276- and 365-day bills), April 24, 1969," in United States. Department of the Treasury. "Volume 164," Press Releases of the United States Department of the Treasury (January 22, 1969 - April 30, 1969) : 650-651. https://fraser.stlouisfed.org/title/6111/item/587007/toc/541396 , accessed on June 24, 2024.