Okla. Stat. tit. 12, § 12-3005: Public records

The contents of an official record or of a private record

authorized to be recorded or filed in the public records and

actually recorded or filed, if otherwise admissible, may be proved

by a copy in perceivable form, certified as correct in accordance

with Section 2902 of this title or testified to be correct by a

witness who has compared it with the original. If a copy which

complies with this section cannot be obtained by the exercise of

reasonable diligence, other evidence of the contents may be

admitted.