Unreserved public lands of the United States, exclusive of
Alaska, which have been withdrawn or classified as coal lands or
are valuable for coal shall, in addition to the classes of entries
or filings described in sections 83 to 85 of this title be subject
to selection by the several States within whose limits the lands
are situate, under grants made by Congress, and to disposition, in
the discretion of the Secretary of the Interior, under the laws
providing for the sale of isolated or disconnected tracts of public
lands, but there shall be a reservation to the United States of the
coal in all such lands so selected or sold and of the right to
prospect for, mine, and remove the same in accordance with the
provisions of said sections, and such lands shall be subject to all
the conditions and limitations of said sections.