Ill. Admin. Code tit. 23, § 3030.235
a) Merger of One Multitype Library System into Another Library System
1) In the event that the board of directors of a multitype library system determines to terminate the system in order to merge the service area of the system into another adjoining library system, each board shall poll the member libraries of the system. The library systems must make every effort to publicize the votes widely and in formats accessible to members. If at least two-thirds of the full member libraries that vote on the issue support the proposed merger in each system area, the board of directors of the affected library systems shall submit an application for merger to the State Librarian stating the intent of the member libraries. The application shall contain:
b) Merger of Two Multitype Library Systems