Motor vehicles. Amending clause (4b) of subsec. (b) of sec. 203 of motor carrier act, 1935. report to accompany S. 3915 [to amend clause (4b) of subsec. (b) of sec. 203 of motor carrier act, 1935, so as to exempt from its provisions vehicles operated by federation of cooperative associations of producers of agricultural products]; submitted by Mr. Barkley for Mr. Wheeler.