Participate in development. 

 - Paris :  Unesco,  c 1986. 
 - 371 p.  24 cm. 
<br/><br/>323  323 
<br/><br/><label>ISBN: </label>92-3-102180-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Production.
<br/><br/><label>Dewey Class. No.: </label>338.9 / U3p