United States. Department of the Treasury. "Withholding of appraisement of aluminum ingot from Canada, February 20, 1973," in United States. Department of the Treasury. "Volume 182," Press Releases of the United States Department of the Treasury (January 2, 1973 - February 28, 1973) : 535-536. https://fraser.stlouisfed.org/title/6111/item/587025/toc/542975 , accessed on June 25, 2024.