The Secretary of the Interior is authorized and directed to make an examination of the Horseshoe Bend Battle Ground with a view to determining the area or areas thereof deemed desirable for inclusion in the Horseshoe Bend National Military Park and which, except for not more than twenty acres of any other lands adjacent to such battleground found by the Secretary to be necessary to carry out the provisions of sections 430ff to 430jj of this title, lie within the lands particularly described as follows: Sections 13, 14, 15, 22, and 23, all township 23 north, range 23 east, Saint Stephens meridian.