25 C.F.R. § 82.5 Sufficiency of a petition.
Title 25 - Indians
(a) The numerical sufficiency of any petition submitted pursuant to this part shall be based upon a number determined by the local Bureau official: (1) By consultation with the tribal governing body regarding the current number of tribal voters; or (2) For reorganized tribes, the number of members considered eligible to register for a Secretarial election and who are at least 18 years of age. (b) The number shall be made available to the spokesman for the petitioners upon request along with a cut-off date when, for purposes of the petition, no further names will be added.
Title 25: Indians
PART 82—PETITIONING PROCEDURES FOR TRIBES REORGANIZED UNDER FEDERAL STATUTE AND OTHER ORGANIZED TRIBES
§ 82.5 Sufficiency of a petition.

