Otto, Henry John,  1901- <br/><br/>
Principles of elementary education/ 
by Henry J. Otto, Hazel Floyd and Margaret Rouse. 
 - Revision edition. 
 - New York:  Greenwood Press,  1955. 
 - 455 pages:  illustrations;  24 cm. 
<br/><br/><label>ISBN: </label>0837124395 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Education, Elementary.