1977—Subsec. (b). Pub. L. 95–164, § 203(a), substituted “The Secretary of the Interior in coordination with the Secretary shall immediately initiate studies” for “The Secretary shall immediately initiate studies”.

Subsecs. (c), (d). Pub. L. 95–164, § 203(b), struck out subsec. (c) which related to the modification of standards, and subsec. (d) which related to the applicability of section 553 of title 5 in cases where the provisions of sections 862 to 878 of this title had provided that certain actions, conditions, or requirements be carried out as prescribed by the Secretary or the Secretary of Health, Education, and Welfare.

Amendment by Pub. L. 95–164 effective 120 days after Nov. 9, 1977, except as otherwise provided, see section 307 of Pub. L. 95–164, set out as a note under section 801 of this title.

Section operative 90 days after Dec. 30, 1969, except to the extent an earlier date is specifically provided for in Pub. L. 91–173, see section 509 of Pub. L. 91–173, set out as a note under section 801 of this title.