Ball, W. W. Rouse <br/><br/>
Mathematical recreations & essays 
by W. W. Rouse Ball. 
 - 10th ed. 
 - London  The Macmillan company  1931. 
 - xiii, 366 p., 1 l.  illus., diagrs.  21 cm. 
<br/><br/>Includes bibliographical footnotes and index. 
<br/><br/><label>LCCN: </label>evn00001446 //r872 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical recreations.<br/>Ciphers.<br/>Cryptography.<br/>Geometry--Problems, Famous.
<br/><br/><label>LC Class. No.: </label>QA95  / .B2 1939 
<br/><br/><label>Dewey Class. No.: </label>510.76