Simple reading material for adults :    its preparation and use /  
UNESCO 
 - Switzerland :    UNESCO,    1963 
 - 95 p. :    ill. ;    21 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Adult education.
<br/><br/><label>Gov. Doc. Class. No.: </label>374 SIM