United States. Department of the Treasury. "Bill Tender, February 12, 1963, Release Number d-751," in United States. Department of the Treasury. "Volume 135," Press Releases of the United States Department of the Treasury (January 2, 1963 - March 27, 1963) : 317-320. https://fraser.stlouisfed.org/title/6111/item/586978/toc/539069 , accessed on June 22, 2024.