Wittich, Walter Arno. <br/><br/>
Audio-visual materials :  Their nature and use / 
Walter Arno Wittich and Charles Francis Schuller. 
 - New york :  Harper & brothers,  c 1953. 
 - xx, 564 P. :  ill. ;  25 cm. 
 - Exploration series in education. .
<br/><br/> Includes index. 
<br/><br/>11  11 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Instructional Materials.
<br/><br/><label>Dewey Class. No.: </label>371.33 / W785a