Section, acts June 17, 1930, ch. 497, title IV, § 482, 46 Stat. 720; Proc. No. 2695, July 4, 1946, 11 F.R. 7517, 60 Stat. 1352; Oct. 25, 1951, ch. 562, § 4(4), 65 Stat. 640; Aug. 8, 1953, ch. 397, § 16(a), 67 Stat. 517; June 2, 1970, Pub. L. 91–271, title III, § 301(h), 84 Stat. 288, set forth requirements for certified invoices including time of certification, declarations, number and destination of copies, and certification by other than an American consulate in remote areas.