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DRYAD (Cryptography) sample cipher sheet.Cropped from Figure 20 in the on-line course "IS1100 Signal Operation Instructions (SOI) Edition A" issued by the U.S. Army Institute for Professional Development (AIPD), U.S. Army Training Support Center, Newport News, Virginia 23628-0001
Originally downloaded from https://hosta.atsc.eustis.army.mil/ cgi-bin/atdl.dll/accp/is1100/is1100_top.htm (this link no longer works).
As a U.S. Government publication it is not copyrighted.
This work is in the public domain because it is a work of the United States Federal Government. This applies worldwide. See Copyright.
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