Erdos, Renee F. <br/><br/>
Teaching by correspondence / 
Renee F. Erdos. 
 - London:  Longmans, Green & Co Limted,  c1967. 
 - xvi, 218 p. :  23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Distance education.<br/>Correspondence schools.
<br/><br/><label>Dewey Class. No.: </label>374.4  / E66