25 U.S.C. § 425 — Classification and appraisement of unallotted and unreserved landsreserved

The Secretary of the Interior is authorized to have unallotted or otherwise unreserved land classified — or reclassified — and appraised — or reappraised. This applies to land within any Indian reservation that was opened up for settlement and entry. The Secretary can do this in whatever way he thinks best. It applies when the land was never classified and appraised the way the law opening that reservation required. It also applies when the Secretary of the Interior believes an existing classification or appraisal is wrong.