43 U.S.C. § 473, 474
Section 473, act Dec. 5, 1924, ch. 4, § 4, subsec. F, 43 Stat. 702, related to payment of project construction charges in installments after .
Section 474, act Dec. 5, 1924, ch. 4, § 4, subsec. F, 43 Stat. 702, related to modification of contracts existing prior to , in respect to payment of construction charges.