United States. Department of the Treasury. "Lead and Zinc, November 13, 1964, Release Number d-1403," in United States. Department of the Treasury. "Volume 145," Press Releases of the United States Department of the Treasury (October 1, 1964 - November 30, 1964) : 314-317. https://fraser.stlouisfed.org/title/6111/item/586988/toc/539569 , accessed on June 23, 2024.