Visual aids :    films, filmstrips and transparencies, part IV. 

 - London :    Educational Foundation for visual Aids,    1968. 
 - 200 p. ;    21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Visual aids.
<br/><br/><label>Dewey Class. No.: </label>778.2 VIS