United States. Department of the Treasury. "Bill Tender, March 7, 1966, Release Number f-394," in United States. Department of the Treasury. "Volume 153," Press Releases of the United States Department of the Treasury (February 1, 1966 - March 30, 1966) : 530-532. https://fraser.stlouisfed.org/title/6111/item/586996/toc/539972 , accessed on June 23, 2024.