The multilateral exchange of educational audio-visual materials    : existing mechanisms and suggestions for the future 

 - Paris   : UNESCO,   1980 
 - 117p.   : ill.   ; 24cm. 
<br/><br/><label>ISBN: </label>9231016948 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio-visual materials<br/>Science<br/>Study and teaching<br/>Mechanism (philosophy)
<br/><br/><label>LC Class. No.: </label>IKR Q190.E34