Babbage, Charles. <br/><br/>
Charles Babbage and his calculating engines :  selected writings / 
edited and introduced by Philip Morrison and Emily Morrison. 
 - New York, N.Y. :  Dover Publications,  1961. 
 - xxxviii, 400 p., 15. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculators.<br/>Scientists--Correspondence.