((a)) ** .—** The Secretary shall prescribe regulations appropriate for the implementation of this subchapter.

((b)) ** .—** The regulations—

((1)) shall include appropriate provisions to ensure that concession services and facilities to be provided in a System unit are not segmented or otherwise split into separate concession contracts for the purposes of seeking to reduce anticipated annual gross receipts of a concession contract below $500,000; and

((2)) shall further define the term “United States Indian, Alaskan Native, and Native Hawaiian handicrafts” for the purposes of this subchapter.