The public-land laws of the United States be, and the same are, extended to the public lands in that part of the Red River between the medial line and the south bank of the river, in Oklahoma, between the ninety-eighth meridian and the east boundary of the territory established as Greer County by the Act of May 4, 1896 (29 Stat. 113): Provided, That such lands shall not be subject to disposition, settlement, or occupation until after the same have been classified and opened to entry, and other disposal by the Secretary of the Interior according to law.