United States. Department of the Treasury. "Monthly bill offering on 273-day bills and 365-day bills, December 16, 1968," 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) : 503-505. https://fraser.stlouisfed.org/title/6111/item/587006/toc/541252 , accessed on June 23, 2024.