National banking associations located in reserve cities or central reserve cities shall maintain reserves provided for in section 462 of this title for banks so located.

(R.S. § 5191 (part); Dec. 23, 1913, ch. 6, §§ 19, 27, 38 Stat. 270, 274; Aug. 4, 1914, ch. 225, 38 Stat. 682; Aug. 15, 1914, ch. 252, 38 Stat. 691; June 21, 1917, ch. 32, § 10, 40 Stat. 239.)