The regional library agreement may, from time to time, be amended or supplemented by the adoption of similar resolutions by all the boards of chosen freeholders of the participating counties. A copy of the original regional library agreement, of any amendments or supplements thereto and of the resolutions approving such agreement, amendments or supplements shall be filed with the State Librarian and with the Director of the Division of Local Government.
N.J.S. § 40:33-13.5