Okla. Stat. tit. 19, § 346

Said board is authorized to procure for their county a copy of field notes, of the original survey of their county by the United States, and cause a map of the county to be constructed therefrom on a scale of not less than one inch to a mile, and laid off in congressional townships and sections, to be kept open in the office of the county clerk, and the field notes to be deposited in the same office.