To improve learning;  a report to the President and the Congress of the United States. 

 - Washington,  1969. 
 - ii, 247 p.  27 cm. 
<br/><br/>Bibliography: p. 232-247. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Educational innovations.<br/>Teaching--Aids and devices.
<br/><br/><label>LC Class. No.: </label>LB1043  / .A45