Powell, L. S. <br/><br/>
A guide to the use of visual aids 

 - 4th ed. 
 - London  British Association for Commercial and industrial Education  1981 
 - 36p. 
<br/><br/><label>ISBN: </label>851710697  €3.45 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education<br/>Method of instructions
<br/><br/><label>Dewey Class. No.: </label>371.3  / POW