No books are to be removed from the county law libraries unless signed for in the office of the clerk of the district court or office of the district judge. All books signed for must be returned to the library within 1 week from the date taken. All books used in the libraries must be returned to their proper place in the bookcase on the same day such books are used. Additional library rules may be ordered by a district judge and conspicuously posted in the applicable office of the clerk of the district court and in the library.