Board of Governors of the Federal Reserve System (U.S.), 1935-. "Approval of application of Banc One Corporation to acquire Croghan and Associates, Inc. and engage de novo in certain medical payment services and other data processing activities" in Press Releases of the Board of Governors of the Federal Reserve System
(December 22, 1993).
https://fraser.stlouisfed.org/title/9237/item/692828, accessed on January 19, 2026.