Ashton, Christina
Codes and ciphers Print Christina Ashton - Cincinnati, Ohio Betterway Books 1993 - pg. 110 Includes content
Includes index and appendices
Provides the history behind codes and ciphers as used in spying and explains how readers themselces can make and use their own secret codes.
155870292X
Cryptography Juvenile literature
Ciphers
j652.8 Ash 26
Codes and ciphers Print Christina Ashton - Cincinnati, Ohio Betterway Books 1993 - pg. 110 Includes content
Includes index and appendices
Provides the history behind codes and ciphers as used in spying and explains how readers themselces can make and use their own secret codes.
155870292X
Cryptography Juvenile literature
Ciphers
j652.8 Ash 26