7 U.S.C. § 2227 : US Code - Section 2227: Traveling expenses

Search 7 U.S.C. § 2227 : US Code - Section 2227: Traveling expenses

The Secretary of Agriculture is authorized to purchase from
appropriations made for traveling expenses for employees of the
Department of Agriculture, mileage and mileage books, at commercial
rates, in the manner in which such mileage or mileage books are
usually purchased.