Board of Governors of the Federal Reserve System (U.S.). Division of Research and Statistics. "March 1980 : Monthly Series," E.15 Agricultural Finance Databook (). https://fraser.stlouisfed.org/title/1279/item/530705, accessed on April 17, 2024.
Board of Governors of the Federal Reserve System (U.S.). Division of Research and Statistics. "March 1980 : Monthly Series," E.15 Agricultural Finance Databook (). https://fraser.stlouisfed.org/title/1279/item/530705, accessed on April 17, 2024.