Okla. Stat. tit. 27A, § 27A-3-3-402: Certificate of Secretary of State as evidence

In any suit, action or proceeding involving the validity or

enforcement of, or relating to, any contract, proceeding or action

of a district, the district shall be deemed to have been established

in accordance with the provisions of the Conservation District Act

upon proof of the issuance of a certificate of organization to a

soil conservation district or a soil and water conservation district

by the Secretary of State. A copy of such certificate duly

certified by the Secretary of State shall be admissible in evidence

in any such suit, action or proceeding and shall be proof of the

filing and contents thereof.