25 CFR 213.10 - Lessor's signature.
Any Indian who cannot write his name will be required to sign all official papers by making a distinct thumbprint which shall be designated as “right” or “left” thumbmark. Such signatures must be witnessed by two persons, one of whom must be a U.S. Government employee (such as field clerk, postmaster, U.S. Commissioner, etc.).
Title 25 published on 2014-04-01
no entries appear in the Federal Register after this date.