Such insurers may invest in farm loan bonds, consolidated farm loan bonds, collateral trust debentures, consolidated debentures, or other obligations issued under the Federal Farm Loan Act, approved July 17, 1916, as amended (Title 12 U.S.C. Sections 636 to 1012 inclusive, and Sections 1021 to 1129 inclusive), and the Farm Credit Act of 1933, as amended (Title 12 U.S.C. Sections 1131 to 1138f inclusive), and the Farm Credit Act of 1971 (Title 12 U.S.C. Sections 2001 to 2259 inclusive). Under this section such insurers may invest in farm loan bonds and consolidated farm loan bonds issued by federal land banks, consolidated collateral trust debentures and all other debentures issued by federal intermediate credit banks, debentures issued by the Central Bank for Cooperatives and consolidated debentures issued by banks for cooperatives.