Morton, Robert Lee. <br/><br/>
Making sure of arithmetic :  grade two / 
Robert Lee Morton and Merle Gray. 
 - Chicago :  Silver Burdett,  c 1947. 
 - iii, 252 p. :  ill. ;  21 cm. 
<br/><br/>310  310 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic.
<br/><br/><label>Dewey Class. No.: </label>511 / M846m