Federal Reserve Bank of Chicago. "[Supplement No. 1 to Operating Circular No. 8, Revised, Termination of Daylight Savings Time], Circular No. 1410" in Federal Reserve Bank of Chicago Bulletins and Circular Letters
(September 20, 1950).
https://fraser.stlouisfed.org/title/7180/item/658573, accessed on September 10, 2024.