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- 80011407 abstract "Presents several easy codes with messages to decode and directions for making and writing with invisible ink and devising one's own code.".
- 80011407 contributor B3737468.
- 80011407 contributor B3737469.
- 80011407 created "1980.".
- 80011407 date "1980".
- 80011407 date "1980.".
- 80011407 dateCopyrighted "1980.".
- 80011407 description "Presents several easy codes with messages to decode and directions for making and writing with invisible ink and devising one's own code.".
- 80011407 extent "32 p. :".
- 80011407 identifier "0531041468".
- 80011407 isPartOf "An Easy-read activity book".
- 80011407 issued "1980".
- 80011407 issued "1980.".
- 80011407 language "eng".
- 80011407 publisher "New York : F. Watts,".
- 80011407 subject "001.54/36".
- 80011407 subject "Ciphers Juvenile literature.".
- 80011407 subject "Ciphers.".
- 80011407 subject "Z103.3 .F55".
- 80011407 title "Secret codes / by Helen Jill Fletcher ; illustrated by Michael Cooper.".
- 80011407 type "text".