U.S. Savings Bonds Issues and Redeemed through January 31, 1972, February 9, 1972
United States. Department of the Treasury. "U.S. Savings Bonds Issues and Redeemed through January 31, 1972, February 9, 1972," in United States. Department of the Treasury. "Volume 177," Press Releases of the United States Department of the Treasury (January 3, 1972 - February 29, 1972) : 337-338. https://fraser.stlouisfed.org/title/6111/item/587020/toc/542557 , accessed on July 11, 2024.