Haas, Kenneth Brooks <br/><br/>
Preparation and use of audio-visual aids 
Kenneth B. Haas,Harry Q. Packer ;drawings by Bert Paul Kuhn. 
 - Revised and enlarged ed. 
 - New York  Prentice-Hall  c1950. 
 - 327 p.  illus. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audiovisual education.
<br/><br/><label>Dewey Class. No.: </label>371.335