Williams, Clyde. "Probing Into The Unusual Metals," in Federal Reserve Bank of Cleveland. "August 1951, Vol. 33, No. 8," Economic Review (Federal Reserve Bank of Cleveland) (August 1951) : 12-12. https://fraser.stlouisfed.org/title/1328/item/4509/toc/118122 , accessed on May 2, 2024.