54 U.S.C. § 101926

(a) In General .— The Secretary shall prescribe regulations appropriate for the implementation of this subchapter. (b) Contents .— 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.