United States. Department of the Treasury. "Bill Tender, March 20, 1956," in United States. Department of the Treasury. "Volume 106," Press Releases of the United States Department of the Treasury (January 5, 1956 - April 26, 1956) : 220-224. https://fraser.stlouisfed.org/title/6111/item/586949/toc/537150 , accessed on June 25, 2024.