Hours of work in coal mines :  report iv : fouth item on the agenda / 
International Labour Organization 
 - Geneva :  International Labour Office,  1949 
 - 58 p. ;  24 cm. 
<br/><br/> At head of title : Report 4. International Labour Organisation. Coal Mines Committee, 3d sess., Pittsburg, Apr. 1949 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Coal mines and mining<br/>Coal miners<br/>Hours of labor
<br/><br/><label>Dewey Class. No.: </label>331.76223