Heddens, James W., 1925-  Heddens, James W., 1925- <br/><br/>
Today's mathematics :  a guide to concepts and methods in elementary school mathematics. / 
by James W. Heddens ; pupil material prepared by Marge L. Smith. 
 - Chicago :  Science Research Associates,  c1968. 
<br/><br/>Includes bibliographies. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics -- Study and teaching (Elementary)--Mathematics -- Study and teaching (Elementary)