To finance its activities, the Corporation may issue revenue bonds payable from corporate revenue to the Secretary of the Treasury. The total face value of all bonds so issued shall not be greater than $140,000,000. Not more than fifty per centum of the bonds may be issued during any one year. Such obligations shall have maturities agreed upon by the Corporation and the Secretary of the Treasury, not in excess of fifty years. Such obligations may be redeemable at the option of the Corporation before maturity in such manner as may be stipulated in such obligations, but the obligations thus redeemed shall not be refinanced by the Corporation. The Secretary of the Treasury is authorized and directed to purchase any obligations of the Corporation to be issued hereunder and for such purpose the Secretary of the Treasury is authorized to use as a public debt transaction the proceeds from the sale of any securities issued under chapter 31 of title 31, and the purposes for which securities may be issued under chapter 31 of title 31 are extended to include any purchases of the Corporation’s obligations hereunder.

Effective as of October 21, 1970, the obligations of the Corporation incurred under subsection (a) of this section shall bear no interest, and the obligation of the Corporation to pay the unpaid interest which has accrued on such obligations is terminated.