United States. Department of the Treasury. "Monthly bill tender on 275-day bills and 365-day bills, February 20, 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) : 66-67. https://fraser.stlouisfed.org/title/6111/item/587007/toc/541326 , accessed on June 24, 2024.