Davidson, Raymond <br/><br/>
Audiovisual materials 

 - 2nd ed. 
 - Pennsylvania  ; International Textbook Company  , 1969 
 - xix,266p. 
<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education<br/>Method Of Instructions
<br/><br/><label>Dewey Class. No.: </label>371.3  / DAV