Okla. Stat. tit. 62 § 57.133
The bonds and interest coupons attached thereto shall be delivered to the purchaser thereof only upon payment of par and accrued interest to the date of delivery thereof, together with any premium bid, if any. The proceeds of the sale of said bonds shall be deposited in the State Treasury of the State of Oklahoma, in the State of Oklahoma Building Bonds of 1968 Fund, where they shall remain subject to disposition as provided for by the Legislature of Oklahoma, provided that the State Treasurer of the State of Oklahoma, when so directed by any agency to which a portion of such fund has been appropriated as to the amount appropriated to such agency, shall invest the amounts designated by such agency for the period or periods of time specified by such agency in direct obligations of the United States of America or in certificates of deposits from banks in the State of Oklahoma acceptable as depositories by the State Treasurer when such certificates of deposits are secured by the acceptable collateral and yield as much or more than direct obligations of the United States of America, and provided further that all such investments of said monies must be so made that the same shall mature in time to enable the State of Oklahoma to issue warrants for payment of the valid indebtedness incurred for the purpose for which said bonds are issued, when the said indebtedness has been incurred pursuant to legislative authority. It shall be the duty of each agency receiving an appropriation to promptly certify to the State Treasurer the amount of all sums not needed for payment of construction and other legal expenditures payable from the fund to meet the construction payment schedule, and upon receipt of such certification the State Treasurer shall forthwith make the aforementioned investment. All interest received by the State Treasurer upon the above-mentioned securities after June 30, 1972, shall be deposited in the State of Oklahoma Building Bonds of 1968 Sinking Fund. Any appropriations of such deposited interest enacted prior to June 30, 1972, for the agency for which the investment was made may be expended as provided therein. Any unappropriated amounts of such deposited interest credited on June 30, 1972, to the agency for which the investment was made, as formerly authorized by this section, shall be transferred to the General Revenue Fund.
Okla. Stat. tit. 62, § 57.133