Codes and ciphers : clever devices for coding and decoding to cut out and make /
Jenkins, Gerald.
Codes and ciphers : clever devices for coding and decoding to cut out and make / by Gerald Jenkins. - Norfolk : Tarquin, 2002. - 32 p. : 30 cm.
1899618538
Codes.
Mathematical recreations.
Chipers.
Codes and ciphers : clever devices for coding and decoding to cut out and make / by Gerald Jenkins. - Norfolk : Tarquin, 2002. - 32 p. : 30 cm.
1899618538
Codes.
Mathematical recreations.
Chipers.