Pettofrezzo, Anthony.   Armstrong Lee H.    <br/><br/>
Arthmetic :  
a programmed approach.   Anthony Pettofrezzo      
 - ed  
 - Scottlang   Foresman   1980 
 - 602pg.    
<br/><br/>Includes index and bibliography.      
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmatic  Arithmatic  
<br/><br/><label>Dewey Class. No.: </label>513/PEA