Pub. L. 82-155, tit. V, sec. 503

Sec. 503. Any of the approximate costs enumerated in titles I, II, and III of this Act may, in the discretion of the Secretary concerned, be varied upward 10 per centum and, with the concurrence of the Director of the Bureau of the Budget, by such further amounts as may be necessary to meet unusual cost variations, but the total cost of all work so enumerated under each of such titles shall not exceed the total appropriations authorized in respect of such title by section 502 of this Act.