The Macmillan guide to correspondence study 
compiled and edited by Modoc Press, Inc. 
 - New York  Macmillan  1983 
 - xii, 497 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Correspondence schools and courses--Directories--United States<br/>Correspondence schools and courses--Handbooks, manuals, etc.--United States