Reduction of hours of work in coal mines. 
Sixth item on the agenda. 
 - Geneva,  International Labour Office,  1939. 
 - iv, 125 p.  24 cm. 
<br/><br/> At head of title: Report VI. International Labour Conference. Twenty-fifth session, Geneva, 1939. 
<br/><br/><label>LCCN: </label>l  39000079  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hours of labor.<br/>Coal mines and mining.
<br/><br/><label>LC Class. No.: </label>HD5119.M6  / I5 1939a