In the event any county shall have outstanding bonds or other indebtedness which were sold or levied for the support and maintenance of a public junior college which was in operation as of July 1, 1964, and such county becomes a part of a legally constituted junior college district as provided in section 37-29-31, the board of supervisors of such county shall continue to levy taxes upon such county until such bonds or other indebtedness shall be fully paid according to the terms thereof.