As a means of providing within township 8 south, ranges 7 and 8 east, and township 9 south, ranges 7, 8, and 9 east, Montana principal meridian, the winter range and winter feed facilities indispensable for the adequate and proper protection, preservation, and propagation of the elk, antelope, and other game animals of the Yellowstone National Park and adjacent lands, the Secretary of the Interior, in his discretion, and subject to the limitation hereinafter prescribed may, and is, authorized to perform the following acts:
16 U.S.C. § 37