U.S. Savings Bonds Issued and Redeemed through December 31, 1969, January 12, 1970
United States. Department of the Treasury. "U.S. Savings Bonds Issued and Redeemed through December 31, 1969, January 12, 1970," 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) : 324-325. https://fraser.stlouisfed.org/title/6111/item/587010/toc/541638 , accessed on June 23, 2024.