International labour Office <br/><br/>
Working environment 

 - First 
 - INTERNATIONAL LABOUR OFFICE  GENEWA  1975 
 - 39p. 
<br/><br/><label>ISBN: </label>9221013669 
<br/><br/><label>Nat. Bib. No.: </label>4127 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth sciences & geology
<br/><br/><label>Universal Decimal Class. No.: </label>551.588  / INT