Cleary, Brian P. <br/><br/>
The mission of addition / 
by Brian P. Cleary. 
 - Minneapolis, MD :  Millbrook Press,  2009. 
 - Math is CATegorical .
<br/><br/><label>ISBN: </label>978-1-57505-859-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic--Study and teaching (primary)<br/>Addition--Study and teaching (primary)