Section was formerly classified to section 1973aa of Title 42, The Public Health and Welfare, prior to editorial reclassification and renumbering as this section. Some section numbers referenced in amendment notes below reflect the classification of such sections prior to their editorial reclassification to this title.

1975—Subsec. (a). Puspan. L. 94–73 struck out “Prior to August 6, 1975,” and “as to which the provisions of section 1973span(a) of this title are not in effect by reason of determinations made under section 1973span(span) of this title”.