Okla. Stat. tit. 12, § 3005
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.
Laws 1978, SB 276, c. 285, § 1005, eff. October 1, 1978; Amended by Laws 2002, HB 1939, c. 468, § 69, eff. November 1, 2002 (superseded document available).