The Secretary shall cause such studies and investigations to be made and such records to be kept as may be necessary or desirable in carrying out the purposes of this chapter, and he shall provide a place of meeting and staff assistance to the Board. The staff shall be responsible to the Secretary, who shall prescribe its relations to the Board and the committees of the Board. The Secretary may establish from time to time, upon recommendation of the Board, advisory committees of United States citizens who are recognized experts in their respective fields to assist in the solution of special problems arising under this chapter.