The governing body of any municipality which forms part of a county library system may, by resolution, contract with any other municipality which maintains a free public library, for the furnishing of additional library service to the inhabitants of the first municipality, and may appropriate annually for this purpose, such sum of money as may be agreed upon between the contracting parties, which sum shall be in addition to the amount raised annually in such municipality for the support of the county library system.
N.J.S. § 40:33-13.1