Howitworks :  The illustated encyclopedia of science and technology. 

 - New York :  Marshall Cavendish,   c 1974. 
 - Vols. :   ill. ;  26 cm. 
<br/><br/>V. 1-Abacus-Archaelogical Techniques ;  
<br/><br/>79  79 
<br/><br/><label>ISBN: </label>0 85685 522 7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Dictionaries.<br/> Encyclopedias.
<br/><br/><label>Dewey Class. No.: </label>503 / I6