Spencer, Peter Lincoln <br/><br/>
Building mathematical competence in the elementary school / 
Peter Lincoln Spencer, Marguerite Brydegaard. 
 - New York:   Holt, Rinehart and Winston,   1966.  
 - 403 p. :  ill. ;  24 cm. 
<br/><br/>Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)
<br/><br/><label>Dewey Class. No.: </label>372.7