Federal Reserve Bank of Dallas. "[North Texas Regional Check Processing Center Expanded to Include All Banks in a 50-mile Radius (Addressed to All Banks in the Eleventh Federal Reserve District)], Circular No. 72-191," District Notices (Federal Reserve Bank of Dallas) (September 7, 1972). https://fraser.stlouisfed.org/title/5569/item/544861, accessed on January 30, 2025.