* Act of June 4, 1936 (P.L. 74-637, Ch. 489, 49 Stat. 1421; 7 U.S.C. 2237)

Funds available for field work in the Department of Agriculture shall be available for employment by contract or otherwise of men with equipment, boats, work animals, animal-drawn, and motor-propelled vehicles. (7 U.S.C. 2237)