25 U.S.C. § 911
The Secretary of the Interior is authorized and directed to prepare a roll of the persons whose names appear on the Quapaw membership roll forwarded under date of , and whose membership in the tribe was then based upon Quapaw blood rather than solely upon adoption, and the descendants of such persons, who are living on . Applications for enrollment must be filed with the area director of the Bureau of Indian Affairs, Muskogee, Oklahoma, on forms prescribed by the Secretary, within six months after . For a period of three months thereafter, the Secretary shall permit the examination of the applications by the Quapaw Tribal Business Committee or by persons having a material interest therein for the purpose of lodging protests against any application. The determination of the Secretary regarding the eligibility of an applicant shall be final.