Pub. L. 83-534, tit. V, sec. 503

Sec. 503. Any of the approximate costs enumerated in titles I, II, III, and IV as to which appropriations are authorized by this Act may, in the discretion of the Secretary concerned, be varied upward by 5 per centum in the case of projects within continental United States and 10 per centum in the case of projects outside the continental United States, but the total cost of all projects so enumerated under each of such titles shall not exceed the total of all amounts specified in respect of projects in such title.