Richardson, C. H.  b. 1890 <br/><br/>
An introduction to the calculus of finite differences/ 
C. H. Richardson. 
 - New York:  Van Nostrand,  [1954]. 
 - vi, 142 p.:  24 cm. 
<br/><br/><label>LCCN: </label>54005779 /L 
<br/><br/><label>Nat. Bib. No.: </label>GB54-11376 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculus.<br/>Difference equations.<br/>Equações Diferenciais Ordinárias.
<br/><br/><label>Dewey Class. No.: </label>515  / R521i