United States. Department of the Treasury. "Exchange of Certificates, June 23, 1947," in United States. Department of the Treasury. "Volume 67," Press Releases of the United States Department of the Treasury (June 5, 1947 - August 4, 1947) : 117-120. https://fraser.stlouisfed.org/title/6111/item/586910/toc/562344 , accessed on June 25, 2024.