16 U.S. Code § 410iii–4 - Acquisition of property
(a) Real property
The Secretary may acquire land or interests in land within the boundaries of the Park, from willing sellers only, by donation, purchase with donated or appropriated funds, or exchange.
(b) Boundary revision
After acquiring land for the Park, the Secretary shall—
(c) Personal property
The Secretary may acquire personal property associated with, and appropriate for, interpretation of the Park.
(d) Conservation easements and covenants
The Secretary is authorized to acquire conservation easements and enter into covenants regarding lands in or adjacent to the Park from willing sellers only. Such conservation easements and covenants shall have the effect of protecting the scenic, natural, and historic resources on adjacent lands and preserving the natural or historic setting of the Park when viewed from within or outside the Park.