Fehr, Howard F.  1901- <br/><br/>
Teaching modern mathematics in the elementary school / 
by Howard F. Fehr and Jo McKeeby Phillips 
 - 2nd ed. 
 - Reading, Mass. :  Addison-Wesley,  1972 
 - xviii, 515 p. :  ill. ;  24 cm. 
<br/><br/>Bibliography: p. 503-505 
<br/><br/><label>ISBN: </label>020102005x 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)