Okla. Stat. tit. 16, § 16-20: Power of attorney - Execution - Recording

A power of attorney in fact for the conveyance of real estate or

any interest therein, or for the execution or release of any

mortgage therefor, shall be executed, acknowledged and recorded in

the manner required by this chapter for the execution,

acknowledgment and recording of deeds and mortgages, and shall be

recorded in the county where the land is situated, and no deed,

mortgage or release of a mortgage executed by an attorney in fact

shall be received for record or recorded until the power under which

the same is executed has been duly filed for record in the same

office; and the recording of any deed, mortgage or release of

mortgage shall be of no effect for any purpose until the power under

which it is executed has been duly filed for record in the same

office. Provided that any power of attorney promulgated by any

agency of the Government of the United States shall be deemed

sufficiently recorded for purposes of this section if the

promulgation thereof shall have been published in the Federal

Registry of the Government of the United States and any instrument

executed pursuant to said power of attorney recites the specific

reference to said publication.