Coppen, Helen <br/><br/>
Aids to teaching and learning 
Helen Coppen 
 - Oxford, London  Pergamon Press  c1969 
 - x, 230p.:  figs. ;  20cm 
<br/><br/> Bibliography at the end 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Teaching--aids and devices
<br/><br/><label>Dewey Class. No.: </label>371.3078/C785a