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.
Okla. Stat. tit. 27A, § 3-3-402