United States. Department of the Treasury. "Monthly bill tender, March 26, 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) : 240-241. https://fraser.stlouisfed.org/title/6111/item/587007/toc/541362 , accessed on June 17, 2024.