In appointing the members of the commission created by section 426 of this title the Secretary of the Interior shall, as far as practicable, select persons familiar with the terrain of the battlefield of Stones River, Tennessee, and the historical events associated therewith.

(Mar. 3, 1927, ch. 374, § 2, 44 Stat. 1399; Ex. Ord. No. 6166, § 2, June 10, 1933; Ex. Ord. No. 6228, § 1, July 28, 1933.)