Gattegno, Caleb <br/><br/>
Mathematics with numbers in colour.  book 1 / 
G. Gattegno. 
 - Reading:   Educational Explorers,   1963.  
 - 102 p. ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Arithmetic
<br/><br/><label>Dewey Class. No.: </label>513