29 C.F.R. § 552.100
Sec. 29(b), 88 Stat. 76; ( 29 U.S.C. 206(f) ); Secretary's Order No. 16-75, dated Nov. 25, 1975 (40 FR 55913), and Employment Standards Order No. 76-2, dated Feb. 23, 1976 (41 FR 9016)