Federal Reserve Bank of Chicago. Research Department and Federal Reserve Bank of Chicago. "Seventy-Five Years, No. 22," Chicago Fed Letter (June 1989). https://fraser.stlouisfed.org/title/5287/item/535756, accessed on April 18, 2024.
Federal Reserve Bank of Chicago. Research Department and Federal Reserve Bank of Chicago. "Seventy-Five Years, No. 22," Chicago Fed Letter (June 1989). https://fraser.stlouisfed.org/title/5287/item/535756, accessed on April 18, 2024.