Each map described in subsection (a) shall be on file and available for public inspection in the office of the Director of the National Park Service, Department of the Interior.
The Secretary of the Interior (referred to as the “Secretary”) may, by notice in the Federal Register after receipt of public comment, make minor adjustments in the boundaries of areas added to the park by subsection (a) and other areas of the park: Provided, That any such minor boundary adjustments cumulatively shall not cause the total acreage of the park to increase more than 10 per centum above the existing acreage of Mound City Group National Monument, plus the acreage of the inclusions authorized under subsection (a).