; (I) the Recreation and Public Purposes Act; or (J) the Weeks Act of 1911; (3) explicitly authorized by Federal law; or (4) completed through a land exchange authorized by Federal law. (c) Limitation The Secretary shall not subdivide Federal land to meet acreage minimums described in subsection (b)(1). 4. Statutory construction Nothing in this Act shall be used to influence or interpret the legality of stepping over a property corner from one parcel of public land to another.