Top secret!

codes to crack

An illustrated explanation of twenty-eight secret codes that can be used to send messages.

A. Whitman
1987
9780807580271
book

Holdings

hidmidmiidnidwidlocation_codelocationbarcodecallnumdeweycreatedupdated
300385064642842137134955208726PCE301PCC0003131652 ALB65216377825731695044385
31835816615067157013495520872622283T 2228011652 ALB65216407292551640729255