Forth-fifth annual report on the statistics of rail-ways in the United States for the year ended December 31, 1931 

 - Washington :  The Bureau of Statistics,  1932 
 - 282 p. ;  30 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Transportation engineering--United States<br/>Railroads--United States<br/>Railroad engineering--United States