Richardson, C.H. <br/><br/>
Introduction to the calculus of finite differences   
by C.H. Richardson 
 - New Jersey  D.Van-Nostrand Company  1960 
 - vi, 142p. 
<br/><br/><label>LCCN: </label>54-5779 
<br/><br/><label>Dewey Class. No.: </label>515.62  / N54