Upon acquisition of the land known as Knob Creek Farm pursuant to subsection (b), the boundary of the Abraham Lincoln Birthplace National Historical Park, established by sections 211 to 214 of this title, is revised to include such land. Lands acquired pursuant to this section shall be administered by the Secretary of the Interior as part of the historic site.
The Secretary of the Interior may acquire, by donation only, the approximately 228 acres of land known as Knob Creek Farm in Larue County, Kentucky, as generally depicted on a map entitled “Knob Creek Farm Unit, Abraham Lincoln National Historic Site”, numbered 338/80,077, and dated October 1998. Such map shall be on file and available for public inspection in the appropriate offices of the National Park Service.
There are authorized to be appropriated such sums as may be necessary to carry out subsection (c).