The National Flood Insurance Act of 1968, referred to in subsec. (b), is title XIII of Pub. L. 90–448, Aug. 1, 1968, 82 Stat. 572, which is classified principally to chapter 50 (§ 4001 et seq.) of Title 42, The Public Health and Welfare. For complete classification of this Act to the Code, see Short Title note set out under section 4001 of Title 42 and Tables.