x  x <br/><br/>
Algebraic & arithmetic structures  A concrete approach for elementary school teachers 

 - x 
 - N.Y.  Free  1976 
 - xxxv, 683 
<br/><br/>x 
<br/><br/><label>ISBN: </label>x 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic - Study & Teaching Arithmetic - Study & Teaching 
<br/><br/><label>Dewey Class. No.: </label>372.72/ALG