United States. Department of the Treasury. "Bill Tender, October 15, 1963, Release Number d-1007," in United States. Department of the Treasury. "Volume 139," Press Releases of the United States Department of the Treasury (October 1, 1963 - November 28, 1963) : 177-178. https://fraser.stlouisfed.org/title/6111/item/586982/toc/539295 , accessed on June 23, 2024.