22 Pa. Code § 131.16
A county library and another local library may seek State aid as merged or conjoined libraries as provided in section 303(3) of The Library Code (24 P.S. § 4303(3)), if, prior to application for State aid as such, the two library boards of directors enter into an agreement to merge the boards in accordance with section 411 of The Library Code (24 P.S. § 4411) by the end of 5 years of participation in State aid as merged or conjoined libraries. An agreement shall be approved by resolution of the municipal governments involved if the members of one or both of the library boards of directors are appointed by those governments.
22 Pa. Code § 131.16
The Library Code (24 P.S. §§ 4101-4503) was repealed by the act of November 1, 2012 (P.L. 1683, No. 210) and replaced by 24 Pa.C.S. Chapter 93 (relating to Public Library Code).