Federal Reserve Bank of Chicago. "4% U.S. Certificates of Indebtedness Dated January 22nd, Maturing April 22, 1918, Circular no. 58" in Federal Reserve Bank of Chicago Bulletins and Circular Letters (January 25, 1918). https://fraser.stlouisfed.org/title/7180/item/655394, accessed on December 3, 2024.