(Pub. L. 91-597, Sec. 15, Dec. 29, 1970, 84 Stat. 1629; Pub. L. 92- 67, Aug. 6, 1971, 85 Stat. 173.) AMENDMENTS 1971 - Subsecs. (b), (c). Pub. L. 92-67 added subsec. (b) and redesignated former subsec. (b) as (c).