((a)) Within the boundaries of the Grand Canyon National Park, as enlarged by sections 228a to 228j of this title, the Secretary of the Interior (hereinafter referred to as the “Secretary”) may acquire land and interest in land by donation, purchase with donated or appropriated funds, or exchange.

((b)) Federal lands within the boundaries of such park are hereby transferred to the jurisdiction of the Secretary for the purposes of sections 228a to 228j of this title.