Okla. Stat. tit. 65, § 182

Any library or libraries owned or operated by the state or any multicounty or district, city-county or joint city-county, county, city, town, or other public library or libraries, may purchase insurance from the funds of such libraries or entities for protection against loss, loss of use, destruction, theft, damages, or other casualties to the property belonging to or used by said libraries or library entities. The ownership and operation of such libraries is hereby declared to be a public governmental function.