United States. Department of the Treasury. "Market transactions in April, May 13, 1969," in United States. Department of the Treasury. "Volume 165," Press Releases of the United States Department of the Treasury (May 6, 1969 - August 29, 1969) : 38-39. https://fraser.stlouisfed.org/title/6111/item/587008/toc/541422 , accessed on June 22, 2024.