For the purposes of § 8-68a the State Treasurer is authorized and directed, subject to and in accordance with the provisions of § 3-20, to issue bonds of the state, from time to time, in an amount which shall not in the aggregate exceed ….* dollars. Such bonds shall be issued in accordance with the provisions of said § 3-20 and the full faith and credit of the state is pledged for the payment of the interest on said bonds as the same become due and the payment of the principal thereof at maturity. Such bonds shall be sold at not less than par and accrued interest and shall bear such date or dates, mature at such time or times not exceeding thirty years from their respective dates and be subject to such redemption privileges with or without premium as may be fixed and determined by the State Bond Commission. Such portion of the proceeds from the sale of such bonds and of any notes issued in anticipation thereof as may be required for such purpose shall be applied to the payment of the principal of any such notes then outstanding and unpaid and the remaining proceeds of any such sale shall be used for the payment of grants and advances under the provisions of § 8-68a. Such payments shall be made by the State Treasurer on certification of the Commissioner of Housing in accordance with the contract between the state and the authority. The Treasurer may invest in direct obligations of the United States of America such of the proceeds of such sale as he deems available for such purpose.