Wages and hours of labor in the Portland cement industry, 1929 ... January, 1931. 

 - Washington,  U.S. Govt. Print. Off.,  1931. 
 - iii, 62 p. incl. tables.  23 cm. 
 - Bulletin of the United States Bureau of Labor Statistics,  no. 525 Wages and hours of labor series .
<br/><br/> At head of title: United States Department of Labor. W.N. Doak, secretary. Bureau of Labor Statistics. Ethelbert Stewart, commissioner.  Issued also as House doc. 579, 71st Cong., 3 sess. 
<br/><br/><label>LCCN: </label>l  31000043  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Wages--United States.<br/>Hours of labor.<br/>Portland cement.
<br/><br/><label>LC Class. No.: </label>HD8051  / .A62 no. 525