Okla. Stat. tit. 16, § 28
No instrument affecting the title to real estate shall be filed for record or recorded unless plainly printed, typed, or handwritten or partly printed, partly typed, or partly handwritten and the instrument is an original or a certified copy of an original instrument, clearly legible in the English language
R.L. 1910, § 1171; Amended by Laws 1996, HB 2796, c. 195, § 2, eff. November 1, 1996; Amended by Laws 1997, HB 1946, c. 1, § 1, emerg. eff. February 18, 1997 (superseded document available); Amended by Laws 1997, HB 2011, c. 233, § 1, eff. May 21, 1997 (superseded document available).