Board of Governors of the Federal Reserve System (U.S.), 1935-. "Approval of application by Hawkeye Bancorporation for Burlington Bank and Trust Company, First National Bank, and Pella National Bank" in Press Releases of the Board of Governors of the Federal Reserve System
(December 19, 1968).
https://fraser.stlouisfed.org/title/9237/item/697712, accessed on January 15, 2026.