United States. Department of the Treasury. "Year-end Statement for 1971, July 28, 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) : 201-242. https://fraser.stlouisfed.org/title/6111/item/587017/toc/542348 , accessed on June 25, 2024.