The board of control of every public library created and maintained under the provisions of this Part may receive and accept unconditional gifts, donations and contributions from individuals and corporations, but no gifts or donations conditionally made shall be accepted without the approval of the governing authority of the parish or municipality creating the public library.  All moneys, property, and other things of value given or contributed to a public library shall be turned over to the treasurer of the board of control and shall be expended or invested by the librarian with the approval of the board of control.