U.S. Savings Bonds Issued and Redeemed through November 30, 1972, December 13, 1972
United States. Department of the Treasury. "U.S. Savings Bonds Issued and Redeemed through November 30, 1972, December 13, 1972," in United States. Department of the Treasury. "Volume 181," Press Releases of the United States Department of the Treasury (October 2, 1972 - December 29, 1972) : 532-533. https://fraser.stlouisfed.org/title/6111/item/587024/toc/542868 , accessed on June 25, 2024.