As soon as practicable after the effective date of this subchapter, the Secretary shall promulgate regulations appropriate for its implementation. Among other matters, such regulations shall include appropriate provisions to ensure that concession services and facilities to be provided in a unit of the National Park System are not segmented or otherwise split into separate concessions contracts for the purposes of seeking to reduce anticipated annual gross receipts of a concessions contract below $500,000. The Secretary shall also promulgate regulations which further define the term “United States Indian, Alaskan Native, and Native Hawaiian handicrafts” for the purposes of this subchapter.