United States. Department of the Treasury. "Monthly Bill Offering, July 21, 1971," in United States. Department of the Treasury. "Volume 174," Press Releases of the United States Department of the Treasury (July 1, 1971 - August 31, 1971) : 108-110. https://fraser.stlouisfed.org/title/6111/item/587017/toc/542329 , accessed on June 25, 2024.