United States. Department of the Treasury. "Weekly Bill Results, April 10, 1972," in United States. Department of the Treasury. "Volume 178," Press Releases of the United States Department of the Treasury (March 1, 1972 - April 29, 1972) : 358-359. https://fraser.stlouisfed.org/title/6111/item/587021/toc/542643 , accessed on June 25, 2024.