Hours of work in coal mines :    item II on the  agenda. 

 - Geneva :    International Labour Office,    1931. 
 - iv, 205 p. ;    21 cm. 
<br/><br/>  At head of title: Report 2. International Labour Conference. 15th se ss., Geneva, 1931. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Coal mines and mining.<br/> Hours of labor.<br/> Coal miners.<br/> Lignite.