Collins national decimal reckoner. 

 - London:   Collins,   1970.  
 - [1], 833 p. ;  19 cm. 
<br/><br/> Text on lining papers 
<br/><br/><label>ISBN: </label>0004342410 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ready-reckoners
<br/><br/><label>Dewey Class. No.: </label>511.80212