The election board shall compile in alphabetical order an official list of registered voters arranged by voting districts, if any. This list shall designate, where applicable, those who have requested an absentee ballot and the members of the tribe who are or will have attained the age of 18 years within 150 days (180 days for Alaska tribes) from the date an election is authorized and who have duly registered to vote. A copy of this list shall be supplied to any district election board and shall be posted at the headquarters of the local administrative unit of the Bureau of Indian Affairs, the tribal headquarters, and at various other public places designated by the election board at least 20 days prior to the election.