Ball, W. W. Rouse (Walter William Rouse), 1850-1925 Mathematical recreations & essays, by W. W. Rouse Ball, revised by H. S. M. Coxeter.

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Ball, W. W. Rouse (Walter William Rouse), 1850-1925

Mathematical recreations & essays, by W. W. Rouse Ball, revised by H. S. M. Coxeter.

Mathematical recreations.

Geometry -- Problems, Famous.

Cryptography.

Ciphers.

Coxeter, H. S. M. (Harold Scott Macdonald), 1907-