The Act of June 29, 1906 (34 Stat. 837), which directed that certain lands now included by this subchapter in the recreation area be designated as the Platt National Park, is hereby repealed, and such lands shall hereafter be considered and known as an integral part of the Chickasaw National Recreation Area: Provided, That within such area the Secretary may cause to be erected suitable markers or plaques to honor the memory of Orville Hitchcock Platt and to commemorate the original establishment of Platt National Park.