Board of Governors of the Federal Reserve System (U.S.), 1935-. "Approval of application of Hawkeye Bancorporation for Jasper County Savings Bank, First Federal State Bank, State Bank and Trust, Clay County National Bank of Spencer, Camanche State Bank, and Citizens National Bank of Boone" in Press Releases of the Board of Governors of the Federal Reserve System
(June 13, 1972).
https://fraser.stlouisfed.org/title/9237/item/698650, accessed on January 20, 2026.