For purposes of making appointments to vacancies in all positions in the Indian Health Service a preference will be extended to persons of Indian descent who are:
(a)
Members of any recognized Indian tribe now under Federal jurisdiction;
(b)
Descendants of such members who were, on June 1, 1934, residing within the present boundaries of any Indian reservation;
(c)
All others of one-half or more Indian blood of tribes indigenous to the United States;
(d)
Eskimos and other aboriginal people of Alaska; or
(e)
Until January 4, 1990 or until the Osage Tribe has formally organized, whichever comes first, a person of at least one-quarter degree Indian ancestry of the Osage Tribe of Indians, whose rolls were closed by an act of Congress.
[43 FR 29783, July 11, 1978, as amended at 54 FR 48246, Nov. 22, 1989]