U.S. Savings Bonds Issued and Redeemed through November 30, 1970, December 7, 1970
United States. Department of the Treasury. "U.S. Savings Bonds Issued and Redeemed through November 30, 1970, December 7, 1970," in United States. Department of the Treasury. "Volume 171," Press Releases of the United States Department of the Treasury (November 2, 1970 - January 29, 1971) : 221-222. https://fraser.stlouisfed.org/title/6111/item/587014/toc/542039 , accessed on May 5, 2024.