Lehrenbaum, Burton. <br/><br/>
By the numbers;  the story of counting from the abacus to the artificial brain.  [electronic resource]  
Illustrated by Virgil Partch. 
 - Hartford,  Veeder-Root  [1966] 
 - iv, 146 p.  illus.  21 cm. 
<br/><br/><label>LCCN: </label>67003107  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Numeration--History.<br/>Arithmetic.
<br/><br/><label>LC Class. No.: </label>QA141.2  / .L4 
<br/><br/><label>Dewey Class. No.: </label>511/.1