United States. Department of the Treasury. "Release Of Drug Metopon, March 18, 1947," in United States. Department of the Treasury. "Volume 66," Press Releases of the United States Department of the Treasury (April 2, 1947 - May 30, 1947) : 119-133. https://fraser.stlouisfed.org/title/6111/item/586909/toc/562281 , accessed on June 25, 2024.