United States. Department of the Treasury. "Final figures for Treasury's Current Cash Offering, May 15, 1961," in United States. Department of the Treasury. "Volume 125," Press Releases of the United States Department of the Treasury (May 2, 1961 - May 31, 1961) : 328-338. https://fraser.stlouisfed.org/title/6111/item/586968/toc/538466 , accessed on June 24, 2024.