30 U.S.C. § 2 : US Code - Section 2: Performance of duties in absence of director

Search 30 U.S.C. § 2 : US Code - Section 2: Performance of duties in absence of director

On and after July 1, 1916, in the absence of the Director of the
United States Bureau of Mines the assistant director of said bureau
shall perform the duties of the director during the latter's
absence, and in the absence of the Director and of the Assistant
Director of the United States Bureau of Mines the Secretary of the
Interior may designate some officer of said bureau to perform the
duties of the director during his absence.