Whenever any historical society or other civic body or corporation, organized for the promotion of historical education, is maintaining a historical museum and library within the territory served by a public library subject to this Act, the board of trustees of such public library may participate in the maintenance of such historical museum and library upon such terms and conditions as may be mutually agreed upon by the board of trustees of such public library and the governing board of such historical society or other civic body or corporation.
75 ILCS 5/4-12