Ryburn, W M <br/><br/>
Principles of teaching / 
by W M Ryburn 
 - New York :  Oxford University Press,  1957. 
 - 244p. : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education
<br/><br/><label>Dewey Class. No.: </label>370  / RYB.P