Federal Reserve Bank of Chicago. "[Proposed Changes to Regulation D, Reserves of Member Banks, and Regulation J, Collection of Checks and Other Items by Federal Reserve Banks], Circular No. 2223" in Federal Reserve Bank of Chicago Bulletins and Circular Letters (March 27, 1972). https://fraser.stlouisfed.org/title/7180/item/666378, accessed on February 1, 2025.