Board of Governors of the Federal Reserve System (U.S.). Division of Research and Statistics. "April 1981 : Quarterly Series," E.15 Agricultural Finance Databook (). https://fraser.stlouisfed.org/title/1279/item/530710, accessed on May 10, 2024.
Board of Governors of the Federal Reserve System (U.S.). Division of Research and Statistics. "April 1981 : Quarterly Series," E.15 Agricultural Finance Databook (). https://fraser.stlouisfed.org/title/1279/item/530710, accessed on May 10, 2024.