United States. Department of the Treasury. "Bill Offering, December 31, 1969," in United States. Department of the Treasury. "Volume 167," Press Releases of the United States Department of the Treasury (November 7, 1969 - January 30, 1970) : 303-305. https://fraser.stlouisfed.org/title/6111/item/587010/toc/541629 , accessed on June 23, 2024.