Okla. Stat. tit. 82, § 82-1130: Approval of bonds by Attorney General -

Incontestablility.

All bonds issued hereunder shall contain the certificate

required by Article 10, Section 29 of the Constitution of Oklahoma.

Such bonds shall be submitted to the Attorney General of Oklahoma

for examination, and when such bonds have been examined and

certified as legal obligations of the issuing Authority by the

Attorney General in accordance with such requirements as he may

make, the same shall be incontestable in any court in the State of

Oklahoma unless suit thereon shall be brought in a court having

jurisdiction thereof within thirty (30) days from the date of such

approval.