TY  - BOOK
AU  - Epstein,Sam
AU  - Epstein,Beryl (Williams)
TI  - The first book of codes and ciphers,
T2  - The First books
PY  - 1956///
CY  - New York
PB  - F. Watts
KW  - Ciphers
KW  - Juvenile literature
N2  - The attention of would-be detectives, espionage fans and math students will be captured by the fascinating contents of this book on the history and uses of all kinds of codes and ciphers.  Entertaining and enlightening instructions show how readers can make their own codes and invisible ink from ordinary home materials
ER  -