Freitag, Herta Taussig. <br/><br/>
The number story. 

 - Washington  National Council of Teachers of Mathematics  [1960] 
 - 76 p. 
<br/><br/><label>LCCN: </label>61000098  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Numerals<br/>Mathematical notation.<br/>Numeration