Section, acts July 16, 1892, ch. 196, 1, 27 Stat. 197; Mar. 3, 1893, ch. 211, 1, 27 Stat. 689; Feb. 14, 1903, ch. 552, 10, 32 Stat. 829; Aug. 23, 1912, ch. 350, 1, 37 Stat. 407; Mar. 4, 1913, ch. 141, 1, 37 Stat. 736, related to returns of exports to foreign countries leaving the United States by rail. See section 301 et seq. of Title 13, Census.