Okla. Stat. tit. 20 § 1208
Such board of trustees, by a majority vote of all their members, shall have power:
First: To make and enforce all rules, regulations and bylaws necessary for the administration, government and protection of such library, and all property belonging thereto, or that may be loaned, devised, bequeathed or donated to the same.
Second: To remove any trustee for just cause, and fill all vacancies that may from any cause occur on the board.
Third: To define the powers and prescribe the duties of its officers, and to provide for the time and manner of their selection.
Fourth: To elect all necessary subordinate officers, including a librarian and such assistants as may be necessary, and to prescribe their duties and fix the salary of same, and at their pleasure remove any such officer or assistant.
Fifth: To purchase books, journals, publications, and other personal property, the title to which shall be in the county.
Sixth: To order the drawing and payment, upon properly authenticated vouchers, duly certified by the president and secretary, of money from the Law Library Fund, for any liability or expenditure herein authorized, and generally to do all that may be necessary to carry into effect the provisions of this act.
Okla. Stat. tit. 20, § 1208