McKown, Harry C. <br/><br/>
Audio-Visual aids to instruction 
<label>/ by </label> McKown, Harry C. 
<label>;</label> Roberts, Alvin B. 
 - 2nd ed. 
 - New York  McGraw-Hill  1949 
 - xvi, 608p.  ill  23 cm. 
<br/><br/><label>Dewey Class. No.: </label>371.33  / MCK