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How to Write Codes and Send Secret Messages
Author: John Peterson
Avaliable on Amazon
I tried to find a good page that covered these codes for kids, but couldn't find anything as good as my copy of ["How to Write Codes and Send Secret Messages"](https://www.amazon.com/Write-Codes-Send-Secret-Messages/dp/0590026062). So here are some clues that might help a kid cursed to be born in the Google era: transposition, acrostic, Morse
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