Erdos, Renee F. <br/><br/>
Teaching by correspondence :  a study undertaken / 
Renee F. Erdos. 
 - London :  Longmans,  c 1967. 
 - xvi, 218 p. :  ill. ;  23 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography : p. 213-214. 
<br/><br/>337  337 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Correspondence schools and courses.
<br/><br/><label>Dewey Class. No.: </label>374.4 / E29t