MacKenzie, Ossian. <br/><br/>
The changing world of correspondence study;  international readings, 
edited by Ossian MacKenzie, and Edward L. Christensen. 
 - University Park,  Pennsylvania State University Press  [1971] 
<br/><br/>Includes bibliographies. 
<br/><br/><label>ISBN: </label>0271001356 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Correspondence schools and courses.
<br/><br/><label>LC Class. No.: </label>LC 5915 MAC 1971