Haas, Kenneth Brooks,  1898- <br/><br/>
Preparation and use of audio-visual aids / 
by Kenneth B. Haas [and] Harry Q. Packer 
 - 3rd ed. 
 - New York :  Prentice-Hall,  1955 
 - 381 p. :  illus. ;  24 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Audio-visual education
<br/><br/><label>Dewey Class. No.: </label>371.33