Mass. Gen. Laws ch. 78 § 11
The board shall have the custody and management of the library and reading room and of all property owned by the town relating thereto. All money raised or appropriated by the town for its support and maintenance shall be expended by the board, and all money or property which the town may receive by gift or bequest for said library and reading room shall be administered by the board in accordance with the provisions of such gift or bequest. The board of any library, for the purpose of improving the services of said library, may enter into an agreement with the board or boards of any neighboring library or libraries, to pay for services in common, or to manage a facility to be operated jointly by more than one municipality, such payments to be shared in accordance with terms of such agreement.
Mass. Gen. Laws ch. 78, § 11