United Nations Industrial Development Organization   <br/><br/>
Audio-visual techniques for industry  (Book) 

 - New York  United Nations  1978 
 - 84p.  30 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio-visual equipment Audio-visual materials
<br/><br/><label>Universal Decimal Class. No.: </label>659.148:6 UNI  / 821