Audiovisual aids 

 - Colombo :  National committee for Audio Visual Aids in Education,  1973. 
 - 78p.;  22cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audiovisual<br/>School Education
<br/><br/><label>Dewey Class. No.: </label>371.335  / AUD