United States. Department of the Treasury. "Treasury offers $1-3/4 billion in December tax bills, July 2, 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) : 258-260. https://fraser.stlouisfed.org/title/6111/item/587008/toc/541481 , accessed on June 22, 2024.