Productivity of labor in merchant blast furnaces ...  December, 1928. 

 - Washington,  U.S. Govt. print. off.,  1929. 
 - viii, 145 p.  incl. tables.  23 cm. 
 - Bulletin of the United States Bureau of labor statistics,  no. 474.  Miscellaneous series .
<br/><br/> At head of title:  U.S. Department of labor.  James J. Davis, secretary.  Bureau of labor statistics.  Ethelbert Stewart, commissioner.  Issued also as House doc. no. 423, 70th Cong., 2d sess. 
<br/><br/><label>LCCN: </label>l  29000060  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Blast furnaces.<br/>Labor productivity.
<br/><br/><label>LC Class. No.: </label>HD8051  / .A62 no. 474