TY  - BOOK
AU  - BALL, Rouse W. W. 
TI  - Mathematical recreations and essays
PY  - 1963///
CY  - London
PB  - Macmillan and co ltd
KW  - Mathematical recreations
KW  - Geometry
KW  - Famous problems
KW  - Crytography
KW  - Ciphers
N1  - Includes references and index
ER  -