Duncan Ernest, R <br/><br/>
School mathematics :  Concepts and skills / 
by Ernest, R  Duncan and et al... 
 - New Jersey :  Houghton mifflin company,  1975. 
 - 453p. ,: 
<br/><br/><label>Subjects--Topical Terms: </label><br/>School mathematics
<br/><br/><label>Dewey Class. No.: </label>510   / DUN.S