"In cargo tons of 2,240 lbs." Title varies slightly. Reports are cumulative from January 1921.
Issuing Body:
Volumes for <1921>-1932 issued by: United States Shipping Board, Bureau of Research; 1933-1935 by: Department of Commerce, U.S. Shipping Board Bureau, Division of Shipping Research; 1936- by: U.S. Maritime Commission, Division of Research.