1981—Subsec. (a). Pub. L. 97–35 substituted “effective only to such extent or in such amounts as are provided in advance in appropriation Acts” for “made only after the amount required for such subscription has been appropriated”.

Amendment by Pub. L. 97–35 effective Aug. 13, 1981, except that any funds authorized to be appropriated shall not be available for use or obligation prior to Oct. 1, 1981, see section 1372 of Pub. L. 97–35, set out as an Effective Date note under section 290i of this title.

Section effective Oct. 3, 1977, except that no funds authorized to be appropriated by this section may be available for use or obligation prior to Oct. 1, 1977, see section 1001 of Pub. L. 95–118, set out as a note under section 282i of this title.