United States. Department of the Treasury. "Subscription Figures 2 1/2% Bonds 1967-72," in United States. Department of the Treasury. "Volume 38," Press Releases of the United States Department of the Treasury (October 11, 1941 - December 11, 1941) : 60-67. https://fraser.stlouisfed.org/title/6111/item/586880/toc/566198 , accessed on September 22, 2023.