The Department, in addition to the moneys which may be received from the sale of revenue bonds and from the collection of tolls and other revenues derived under this chapter, may accept from any federal agency or other public or private body or from any other source grants for or in aid of the construction, maintenance or operation of the Bridge or the payment of the bonds and may receive and accept contributions from any source of either money or property or other things of value, to be held, used and applied only for the purposes for which such grants or contributions may be made.