(Statement 5521, file no. 4-B-1; Bureau of Transport Economics and Statistics.) [Processed. Text and another illustration on p. 1 and 2 of cover. This study has not been adopted by Interstate Commerce Commission.]
Notes:
(Statement 5521, file no. 4-B-1; Bureau of Transport Economics and Statistics.) [Processed. Text and another illustration on p. 1 and 2 of cover. This study has not been adopted by Interstate Commerce Commission.] † Distribution Made by Issuing Office.