Sofge, Ann Cassill <br/><br/>
Math :  Subtraction practice book / 
Ann Cassill Sofge. 
 - Columbus, Ohio :  Essential Learning Products,  1979. 
 - 128 p. :  ill. ;  13 cm. 
 - [ELP practice book series] .
<br/><br/><label>ISBN: </label>0-88309-913-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Matematics