1988—Subsec. (a). Pub. L. 100–653, § 603(3), inserted “and for the payment of travel expenses under sections 460ss–2(j) and 460ss–3(i) of this title” before period at end of first sentence.

Subsec. (b)(3). Pub. L. 100–653, § 603(4), struck out “in carrying out surveys, censuses, and other scientific studies” after “volunteers”.