Federal Reserve Bank of Chicago. "Optional Redemption of Certificates of Indebtedness Series "A" 1920, Dated August 1, 1919, Maturing January 2, 1920, Circular no. 224" in Federal Reserve Bank of Chicago Bulletins and Circular Letters (December 10, 1919). https://fraser.stlouisfed.org/title/7180/item/655636, accessed on September 10, 2024.