44 U.S.C. § 306
The Public Printer shall employ workmen who are thoroughly skilled in their respective branches of industry, as shown by trial of their skill under his direction.
(Pub. L. 90–620, , 82 Stat. 1240.)
Based on 44 U.S. Code, 1964 ed., § 41 (Jan. 12, 1895, ch. 23, § 45, 28 Stat. 607).