Federal Reserve Bank of Chicago. "Information for Collateral Agents of the Second Class for Sales of War Savings Certificate Stamps and U.S. Thrift Stamps, Circular no. 137B" in Federal Reserve Bank of Chicago Bulletins and Circular Letters (December 27, 1918). https://fraser.stlouisfed.org/title/7180/item/655529, accessed on November 23, 2024.