Okla. Stat. tit. 65, § 65-552: Applicability

This act shall apply to any joint city-county public libraries

established and maintained under the provisions of Article X,

Section 10A of the Oklahoma Constitution in any county having a

population of one hundred thousand (100,000) or more according to

the latest Federal Decennial Census, provided, that in counties with

more than one hundred thousand (100,000) population, and having a

metropolitan library system, such library may elect to come under

the provisions of this act upon a majority vote of the city-county

library commission.