United States. Department of the Treasury. "Federal Reserve Note series to be signed by Secretary Barr, January 8, 1969," in United States. Department of the Treasury. "Volume 163," Press Releases of the United States Department of the Treasury (October 1, 1968 - January 20, 1969) : 584-585. https://fraser.stlouisfed.org/title/6111/item/587006/toc/541279 , accessed on June 23, 2024.