U.S. Savings Bonds Issued and Redeemed through September 30, 1972, October 10, 1972
United States. Department of the Treasury. "U.S. Savings Bonds Issued and Redeemed through September 30, 1972, October 10, 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) : 73-74. https://fraser.stlouisfed.org/title/6111/item/587024/toc/542793 , accessed on June 25, 2024.