Freight rates. Long-and-short-haul charges, hearings, 75th Congress, 3d session, on S. 1356, to amend paragraph (1) of sec. 4 of interstate commerce act, as amended (U. S. C., title 49, sec. 4), and H. R. 1668, to amend paragraph (1) of sec. 4 of interstate commerce act, as amended (U. S. C., title 49, sec. 4), Feb. 24-Apr. 12, 1938.